My experience of hacked SLi drivers was on the p5b-d with 7900gt's.
3dmark score rose by 4000 points but I never got a game to work with SLi in the short time I tired it.
As stated in the article, no one has hacked drivers for 8800's - even if they do soon the 9800's are encroaching so... What would be the point?
The mobo will be good at what it does, if you want SLi get an nvidia mobo.
I really want SLi/CF at the moment. I don't know why. My big screen needs it lol.