I'm asking *you* to give me a few good reasons why I might consider upgrading. What would be some of the benefits?
I just happen to like allot of the associated features and variable speed improvements.
You can actually use a USB 2.0 based thumb drive as system cache if you feel the need instead of just adding more ram.
It also has a predictive application system that makes note of what programs you use most often when you start your computer and loads those into memory when the computer starts so they respond faster. (meaning, if you browse the web and do email most it will load those programs into the system cache to speed things up)
So from that, I can gather that the benefits gjones77 listed are 1. Ability to use USB as a system cache. (Don't know that I'll ever need it, but cool anyway.) and 2. My most frequently used applications will open faster (I'm not usually in a rush, but that still sounds nice.)
Maybe I missed something you didn't.
If you like games, you have to upgrade to Vista to get DirectX 10 support. That will guarantee every PC gamer upgrades sooner than later. See Crysis trailers for DX10 in action. MS could have made DX10 avail to XP users, but are using it as leverage to force upgrades. Annoying, but it will work.
http://www.gametrailers.com/gamepage.php?id=2509
Also for games they have the Live Anywhere stuff in Vista which will tie back in the Xbox Live system.