I upgraded yesterday, nothing as speedy as the others listed, but I took out my Cely300A that ran for 1.5 years @464 (but I had to downclock back to 300 a month ago due to stability problems) and replaced with a Cely466. Swapped out my 15" monitor for a 17" (this one may hurt my keyrate, as UT looks very nice on it 😉), and upgraded the home network from 10BT to 100TX.
Next steps is to upgrade our NT4.0 server box to Win2K Server, setup ICS, a perproxy, and get the rack cows up on Klinux. 😀