If you're running Windows 8, even if you absolutely love the new Start screen and ModernUI apps I think you'll still want to check out Start8/ModernMix.
Start8, as many of you know, has become very popular because it brings back the Start menu to the Windows 8 desktop and lets you book directly to it.
Now, ModernMix solves the other biggest criticism with Windows 8, namely that the new WinRT apps (called ModernUI apps or Metro apps) are forced to run full-screen. ModernMix lets you run them in a window, on the desktop, side-by-side with your traditional Windows programs.
Some apps do fine full-screen but many apps seem ridiculous when run full screen. Skype RT, Remote Desktop RT, the Windows store, etc. all seem forced when running full-screen.
When you put Start8/ModernMix together you get all the benefits of Microsoft's new OS without any compromises. There's no downside.
You can download them here:
-> Start8
-> ModernMix
Here's a video of them in action: