Ok, so far i think W7 is pretty good, and much better than Vista, i have been using it for about 5 hours now! The following things i have noticed an improvement on or really like:

• Battery Life is much Longer than Vista when using the same power plan (1 Hour Versus 1.5 Hours)
• The Superbar is much more functional, and the features on it are not just gimmiky, all are genuinely useful
• CPU performance is better and my processor seems more 'powerful' under 7 opposed to Vista
• WMP 12 and WMC now support .ACC music files, which i am really, really pleased about!

Thats some of the things, i will hopefully update sometime soon!