Vispa 0.5.1 (xpy for Vista)
Vispa is an open-source Vista tweaker that easily allows its user to tweak Windows Vista to disable all communication with Microsoft servers, increasing privacy and security, aswell as improving the general performance.
http://vispa.whyeye.org

Vispa 0.5.4 (2009-09-02)
by Jan T. Sott

• added support for 64-bit registry
• added bing to search engine list
• fixed getting username on Windows7 (and perhaps Vista too)
• fixed a bug restoring classic logon
• fixed header compression
• fixed lots of typos
• fixed /debug parameter
• removed cuil from search engine list

http://vispa.whyeye.org/