From Tweak Now:
TweakNow PowerPack is a fully-integrated suite of utilities that lets you fine-tune every aspect of your computer's operating system and Web browser. The Registry Cleaner module provides you with a safe and simple way to clean Windows Registry. For Windows tweaking lovers, the suite provides more than 100 hidden Windows settings in the Windows Secret section. Using modules included in this section, you can easily customize your Windows like geeks do. The Virtual Desktop module lets you run as many as four custom-designed desktop configurations simultaneously, allowing you to tailor your computer screen to your mood and your work requirements.
What's new in this version:
Version 4.0 added support for Windows 8 Developer Preview and minor improvements and bug fixes.