We have covered many freeware tool to tweak Windows 7 including 7Tweak, WinBubbles Lite etc. Sunrise Seven (translated page) is another free tool which allows users to customize and tweak settings in Windows 7. The tweaks are categorized into different sections like UAC, security settings, start menu, Explorer, Performance etc. The application is supported on Windows 7 32 bit and also 64 bit versions.
The configurations are pretty neatly categorized and easy to use.
The application comes with around 70+ start menu buttons animated to replace the default start button on Windows 7.
You can also change the OEM information with this tool. Overall Sunrise Seven is a very good tweaking tool for Windows 7.