WinVistaClub's
Ultimate Windows Tweaker, is freeware. It has
over 130 registry tweaks, but is yet, just a 370 KB .exe file which does not require an install. Its RTW v 1.0 is now available for
download.
Your suggestions, bugs reports, feedback or support requests are most welcome here. Its author,
Ramesh Kumar, Microsoft MVP would be happy to help you out, here.
While giving feedback, please mention your OS & IE version. eg Vista SP1 32bit with IE 8 Beta2.