You don't even need a TH2GO to play in 3 screens; there's a software to enable it: SoftTH (SOFTware TripleHead). I've been using it for like 6 months or so now, and it works wonders, even on different size / aspect ratio monitors (I'm using 1 wide 20" and 2 "square" 17s). The only requirement is for the game to render in DX8 or DX9, it's not compatible with DX10 yet, but hey... It's free. You can download it on kegetys.net. Oh, you also need 3 video outputs, so 2 cards (or one of the GTX295 kind) are required.

Still, if this generation includes this feature natively and it works well, that could make me upgrade sooner than I thought... And even "changing sides"