[citation][nom]apache_lives[/nom]Q6600 @ 3.5, 8gb, 2x250 RAID0, 8800GT - the only thing i notice between Win7 and Vista is my hdd light flickers less, on the downside my MSN Live Messenger crashes and Connections to one of my servers laged (fixed from an update i believe) - cant complain[/citation]
There are more differences between vista and win7 than that!
For instance Vista with some recent update stopped working properly with our meru based wireless network (with a radius server and authentication on web) because vista no longer asks the dns servers if the network awareness software finds 'local only' network.
Thus our vista users have to access a homepage based on ip numbers to be redirected to the login page. Once logged in, they'll have to wait till vista notices it's got internet before they can use it. In windows 7 you get a notice that 'additional login might be required' instead of it just stopping to work. Also the UAC has more levels which is crucial from a business perspective. And the process scheduler is better in windows 7. With an amd phenom or phenom 2, or an i5 or i7 you get a lower power usage with win 7 (vista and xp are adapted for core2 and a64)
And there are probably a host of other improvements in win7 that make it worth using over vista. At home I don't think vista is enough of a poor choice to warrent an upgrade, but anything at work running vista should either be degraded to xp or upgraded to win 7.