I find it hilarious that all of you find Vista a decent OS.
Microsoft now requires that all OpenGL programs be run through a Direct3D layer. What does this mean? Doom3, Quake 3, Call of Duty, and tons of other games will be running under an inferior interface, causing slower framerate, and possibly ruining graphics quality.
On top of this, if you run any OpenGL program in window mode (so its not fullscreen), ALL visual effects in Vista must be disabled. How bass-ackwards is that?
Moving on... the 64bit version which many people will be using in the near future is completely incompatible with 16bit applications. Say goodbye to any old games you enjoy. Anything made before Win95 WILL NOT run, period.
In addition, many games that came out AFTER Win95 will not be able to be installed, because they use a 16 bit installer.
Finally, Windows Vista will be implementing new digital rights management features, including a new "feature" for video makers. Get this:
Producers can now create trailers, and movies, that will only run under certain settings. Producers can even control what MONITOR it plays on. Let's say you see a video from Sony. Sony can force Windows to only allow the video to play on monitors created by Sony.
This, on top of some pretty crappy hardware support, is why I will be avoiding Vista at all costs.