I know I just built a new rig a few months ago (GTX260, X2 6000, 4GB ram) but I pulled the trigger on a new and improved rig last night :)
I have some plans for the other system so I did need some new components so I figured what the hell, might as well upgrade again.
And it is a big upgrade... I got the new intel core I7 processor 920, and 6GB of matching ram. I also got a triple-channel motherboard for it and the new GTX 295 (dual GPU) video card. Oh, and a 24" LCD.
This is the most I've spent on parts since 1999. The motherboard alone was $239. I haven't spent anything more than about $85 on a mobo in about 10 years.
I'm also going to try to fit all of this into a micro atx case - the mobo is matx.
And I'll be going with Windows7 64 bit too.
Hopefully I'll have all of the parts and everything together by Thursday.