Its been shipping for months, but I second Chris Pirillo's statements that Windows Vista is a "beta" product, and not ready for prime time.

If you are buying a PC for your business, you will be much happier ordering one with Windows XP for now.

The interesting thing is that Linux, especially Ubuntu, and Macs are suddenly gaining more traction and market share. The instability of Vista and resource requirements are giving others OS providers a real chance. I personally use 4 computers during the week, and 2 of them are Linux and 1 is XP and one is Vista. The Vista one (the one I am using right now) irritates me daily (AAARRRGGGHHH!). The rest of my computers just work. In fact, my Ubuntu PC even is configured to run Windows programs, and it does so without a problem.