Vista Tweaker 0.5 Beta is a nice new easy-to-use tweak program. It works on XP and Vista, but there are tweaks that works only on Vista. The interface is clean and simple. Every tweak has its description so the user can see what each one does.
There are some unique and uncommon tweaks too. The tweaks are neatly classified under System, UI, IE, Software, Network, Performance & Miscellaneous Tabs.
This 330Kb freeware is worth a try !
Best to create System Restore points before using any tweaking programs.
Homepage.
http://www.ajuaonline.com/software/vistatweaker/
Download.
http://www.majorgeeks.com/VistaTweaker_d5809.html