We have already heard about the tiny app that can easily change your Start menu Orb in Windows 7...
But most third party themes you wish to install require you to replace system files, which can (and often will) result in one big chaotic mess.
So just today I discovered the Windows Theme Installer
which enables you to install third-party themes in both Vista and 7 with more ease. The app proves to be even more useful than it sounds, as it keeps a list of all installed third party themes, so you can switch between them without manually going through the system folders and replacing files again and again. Furthermore, with only one click you can restore the original system files and get the default Windows theme back.
I haven't tested it yet, but it sounds awesome, and I'll definitely try it, maybe even today. Just wanted to share this with everyone in case you haven't heard of this app yet