Re: worth SLi'ing 2 X 6800GT's?
I feel that you would be better off with a better card, like a 7800GT. If you don't spend a lot of time gaming, you may not feel like going through some of the hassels of SLI systems. There are still compatibility issues here and there, you would have a lot more heat in your system, and there is still a lack of true dual monitor support, even though you have ports for four damn monitors!
Two 6800GT's are going to perform, in most cases, not quite as well as a single 7800GT. One good card is always better than two decent cards, and the 7800GT is really a good deal in comparison to how much you'd pay for another 6800GT.