Visual Task Tips is just a 90 kb utility that makes your Windows XP taskbar look like the one that ships with Vista.

You can hover the mouse cursor over any application in the taskbar and instantly see the latest thumbnail screenshot of that Window without actually switching to that application.

Pretty useful when you have tons of similar application open on your screen and the application titles aren't descriptive enough.

Get Visual Task Tips at visualtasktips.com [freeware]