AMD has released the Catalyst 12.3 drivers.  You can pick them up here.  They add official Radeon HD 7000 series support.  Full details are below.  

Feature highlights of the AMD Catalyst™ 12.3 driver:

Windows 7 and Windows Vista support for the AMD Radeon HD 7900 Series, AMD Radeon HD 7800 Series and AMD Radeon 7700 Series
· AMD Catalyst 12.3 now provides support for Windows 7 64-bit/32-bit and Windows Vista 64-bit/32-bit for the following products:
o AMD Radeon HD 7970 Series
o AMD Radeon HD 7950 Series
o AMD Radeon HD 7870 Series
o AMD Radeon HD 7850 Series
o AMD Radeon HD 7770 Series
o AMD Radeon HD 7750 Series
· Windows XP support for the AMD Radeon HD 7900, AMD Radeon HD 7800, and AMD Radeon HD 7700 Series will be made available in AMD Catalyst 12.4



Resolved issues: Highlights of the AMD Catalyst™ 12.3 driver:
AMD Catalyst Control Center startup issues/delays have been resolved
Elder Scrolls: Skyrim : No longer displays flickering and texture corruption with Anti-Aliasing enabled
Alan Wake : A system crash is no longer experienced when running the game in DirectX 9 mode with Crossfire enabled.
Far Cry 2 : A random system hang is no longer experienced when running the game at high in game setting.
Tom Clancy HAWX : No longer crashes after task switching with MLAA (Morphological Anti-Aliasing) and Anti-Aliasing enabled.
Furmark Benchmark : No longer crashes when launched in High Performance mode.
Quake 4 : No longer display corruption after task switching when run in High Performance mode
XPlane : Textures no longer exhibit flicker and corruption.

Yes, it is no longer February, so 12.2 is sort of a misnomer, but AMD has released them anyway.   Here is the driver page to pick them up at.  Below are the new features.

Windows 7 and Windows Vista support for the AMD Radeon HD 7900 Series and AMD Radeon HD 7770 Series

• Enables support for Windows 7 64-bit/32-bit and Windows Vista 64-bit/32-bit
• Windows XP support will be made available in AMD Catalyst 12.4

Super Sampling Anti-Aliasing is now available for DirectX 10 and DirectX 11 applications

• Supported on the AMD Radeon HD 7900 and AMD Radeon HD 7770 Series
• Users can now enable Super Sample Anti-Aliasing and Adaptive Anti-Aliasing through the AMD Catalyst™ Control Center for DirectX® 10 and DirectX® 11 applications.
• Applications must support in game Anti-Aliasing for the feature to work (Forced on Anti-Aliasing through the Catalyst Control Center is not supported for DirectX 10 and DirectX 11 applications)

AMD Eyefinity 2.1 technology enhancements

• Custom resolutions – users can now choose from a much larger set of display resolutions for their AMD Eyefinity configurations
• Dynamic Configuration Changes:  Switching between different display configurations (when physically plugging/un-plugging displays) will occur automatically by loading the appropriate profile
• Taskbar Positioning:  The Windows Taskbar can now be moved and resized based on users preference
• Profile Manager improvements:  Users can now create multiple Display profiles, enabling users to seamlessly switch between various AMD Eyefinity and Display Configurations

This release of AMD Catalyst™ Linux introduces support for the following new operating systems

• RHEL 5.8 early look support
• RHEL 6.2 early look support

AMD Eyefinity 2.1 technology enhancements

• Linux – Eyefinity display groups can now support resolutions of 16kx16k pixels

AMD has released a new Catalyst 12.2. 1 Application Profile that improves CrossFire perfromance for Mass Effect 3, Path of Exile, and The Darkness 2 gets fixes.  Other games including LA Noire also gets performance boosted and a bug fixed.  You can download them here for Windows 7 64 bit.

Description:
This release of AMD Catalyst™ delivers support for the latest AMD CrossFireX™ profiles. A separate executable file ensures users have access to the latest set of profiles installed on their PC.
                                      
                                      New profiles added to this release:
                                               -  Mass Effect 3:  Improves CrossFire performance
                                               -  Path of Exile – Improves CrossFire performance
                                               -  Darkness 2 – Resolves flickering issues on single GPU configurations when Anti-Aliasing is forced on in the Catalyst Control Center
                                               -  Kingdoms of Amalur: Reckoning – Resolves character texture corruption seen using single GPU configurations when Anti-Aliasing is forced on in the Catalyst Control Center
                                               -  Wargame: European Escalation(DirectX 9 version):  Improves CrossFire performance
                                               -  Wargame: European Escalation(DirectX 11 version):  Resolves flickering observed when running in CrossFire mode
                                               -  Mount Blade:  Disables CrossFire to avoid corruption as the title has a capped Frame Rate
                                               -  L.A. Noire (DirectX 11 Version):  Improves CrossFire performance, and resolves flickering seen in shadows

AMD has released Catalyst 12.1 today. You can download the 64 bit Windows 7 here.  Here are the updates on it.

AMD HD3D technology support enhancement
· Enables support for AMD HD3D technology in conjunction with AMD CrossFireX configurations
· Delivers a new Stereo 3D mode over HDMI 1.4a connections - 1080p at 30Hz is now enabled on supported displays.


AMD Catalyst Control Center / Vision Engine Control Center enhancements – Application Profiles
· AMD Catalyst 12.1 Preview driver enables users to create per application profiles to individually control 3D and CrossFireX settings for Direct3D applications
· Please be sure to select the “Restore Factory Defaults” option under the Catalyst Control Center Preferences menu before using the new application profiles feature – this ensures there are no compatibility issues between previous drivers and the new AMD Catalyst 12.1 Preview driver with regards to application profiles

AMD has also released the 12.2 preview Catalyst.  You can pick it up here, but don't if you have a 7900. Keep using that specific driver.  

Feature highlights of the AMD Catalyst™ 12.1 Linux driver:

This release of AMD Catalyst™ Linux introduces support for the following new operating systems
· SLED 11 SP2 early look support
· Ubuntu 11.10 production level support

We have also just released the AMD Catalyst 12.2 Preview:
The AMD Catalyst™ 12.2 Preview includes all of the features found in AMD Catalyst™ 12.1, plus additional fixes that are not included in the AMD Catalyst 12.1 release. Details can be found in the AMD Catalyst 12.2 Preview release notes: http://support.amd.com/us/kbarticles/Pages/Catalyst122Previewdriverrreleasenotes.aspx

Grab the AMD Catalyst 12.2 Preview here: 

http://support.amd.com/us/kbarticles/Pages/Catalyst122Previewdriver.aspx

Please note that AMD Radeon HD 7900 users should keep using the 8.921.2 RC11 driver found here (the 12.2 preview does not supported the AMD Radeon HD 7900 Series): http://support.amd.com/us/kbarticles/Pages/RC11Driver.aspx

Feature highlights of the AMD Catalyst™ 12.2 driver:

AMD Eyefinity 2.1 technology enhancements
· Additional resolution support: Users can now choose from a larger set of resolutions when running AMD Eyefinity
· Dynamic Configuration Changes: Switching between different display configurations will occur automatically when physically plugging/un-plugging displays
· HydraVision enhancements: The Windows Task bar can now be moved and resized based on users preference
· Profile Manager improvements: Increased support for Display Groups (including 5x1) and Extended configurations within the Profile Manager

Yes, I know back in 2006 Nvidia released the 7900GT and GTX.  Sure, forget 6 years ago, and welcome the brand new never used name Radeon 7900.  There is a new driver just for it for Windows 7 64 bit version 8.921.1 RC11 available for download here.