If you're curious about what Vista is like, and either don't have access to it, or simply don't want to bother installing it, you can get some idea using this site.

http://www.windowsvistatestdrive.com/

Have you tried it yet?

Needs Internet Explorer (in order to install an ActiveX) and refuses to work with non-US Windows versions.

Needs Internet Explorer (in order to install an ActiveX) and refuses to work with non-US Windows versions.

Wasn't aware of the US only restriction, but I would assume that most people who were seriously interested in Vista use IE (or at least don't mind using on occasion)