WinUtilities is an award winning collection of tools to optimize and speedup your system performance. this suite contains utilities to clean registry, temporary files on your disks, erase your application and internet browser history, cache and cookies. you can control startup programs that load automatically with windows, find duplicate files, fix broken shortcuts and uninstall unneeded software. other features include secure file deletion, recycle bin shredding, cleaning tasks scheduling and undelete deleted files.
EDIT: Free for about the next 22hours (until 8pm 04 March 2009 Melbourne time).