Yeah sad to say you kinda wasted a ton of money SLI-ing the 8800GTs. Most video cards don't see an improvement unless you quad-SLi it and that's just a waste. But hey, if you have the cash, an extra 10FPS is always nice
Most mobo's these days (new ones, not necessarily the best, just the newer ones) support up to 8G of RAM. That makes Graphic Designer's like me drool over the speed of Photoshop/InDesign/Illustrator