2 good ones:
1st, if your picking a CPU cache is very important, maybe more important than minor changes in clock speed:
http://www.tomshardware.com/2007/10/24/does_cache_size_matter/

And, NVidia came out with a GPU that trashes their high-end models:
http://www.anandtech.com/video/showdoc.aspx?i=3140

Now, if you want to use a 8800GT with Linux, you can’t, at least not yet with advanced 3D graphics and high resolution. The current NVidia drivers don’t work the with 8800GT (you’ll have to use the vesa driver which means no advanced 3D support). But, NVidia should have support soon, very soon in fact. So if you just got one, wait a wee while till the new drivers come out, then test them with your existing NVidia card before you install your kick-ass 8800GT!

Well, I’m hoping the prices for the cards drop to ~$200 by Christmas, at the moment they’re going for ~$280 which I think is because of demand driven by so many rave reviews.