Fudo reports that Asus has four 785G chipset based motherboards.

Next in line are the M4A785TD-M EVO and M4A785TD-V EVO, both pretty much the same except for the fact that the first one is a microATX and the second one is an ATX motherboard, so you can expect the latter one to have additional PCI-Express x16 slot that works in x4 mode, one more PCI-Express x1 and one more PCI slot. Both of these will have the 128MB DDR3 1333 SidePort memory and both feature 8+2-phase power design so that 140W CPUs are supported. In addition to the usual ports, these two will also have a FireWire port as well.

Fudo has details about two DDR2 785G motherboards from MSI.

The MSI 785GT-E63, or the bigger one, has five SATA ports and one powered eSATA port, additional three PCI slots, Gigabit LAN, 7.1-channel HD audio, and DVI, HDMI and D-Sub outputs. The smaller one, MSI 785GTM-E45, which should be cheaper, lacks eSATA and two PCI slots. Unfortunately, as these are meant for the value part of the market, both boards lack SidePort memory.

Fudo has details MSI's 785G chipset motherboards.

The full ATX 785G-E65, and microATX 785GM-E65 and 785GM-E51 all feature MSI's Active Phase Switching, Easy OC for non-BIOS overclocking and all three support AMD's AM3 processors. All three also have support for DDR3 memory with four memory slots, although only the full ATX 785G-E65 supports DDR3-1600 and microATX are limited to DDR3-1333.

You can pick up some of the new 785G motherboards for sale now. I'll list them below.

Asus 785G AM3
Gigabyte 785G AM2
Gigabyte 785G AM3

Fudo details the new MSI NF750-G55. This is their Socket AM3 SLI chipset based on the nForce 750a SLI chipset.

In addition to AMD AM3 support, the new motherboard also comes with four DDR3-1800 memory slot, two PCI-Express x16 slots, integrated DirectX 10 capable graphics similar to the Geforce 8300, five SATA ports, 7.1-channel audio, Gigabit LAN, one eSATA port, and DVI, HDMI and D-Sub outputs.