so what exactly are you wanting a SLI ATX board or have you changed you mind.
not looking good on lga775 SLI mATX boards by the way so maybe you need to give that idea up..
I am looking for AM2-mobo with DDR2 and SLI-support (x16/x16). Then I dont need to buy a new CPU and RAM. And an mATX mobo rather than ATX mobo, so I dont need to buy new case..
But I bet that those AM2 SLI-mobos are very hard to find.