iSysCleaner is a freeware system optimization tool. It removes all unused files from your system with few clicks and faster - freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet History and Cookies. But the best part is that you can define your own search script.

Cleans:
Tracking Cookies
Internet Explorer Cache, Hisotry, Address Bar History and 'index.dat' files
Outlook Express (only if installed)
Windows and Office recent files
User junk files
Office Outlook Junk e-mail and Deleted Items
Windows Updates uninstallation files
Windows Updates orphan uninstallation files
Windows temp files
Windows Error Reporting files (only for Windows Vista)
Internet Explorer 7 Updates uninstallation files
Prefetch files
Global system junk files
Mozilla Firefox cache and cookies (multi-profiles)
Flock Browser cache and cookies (multi-profiles)
Third party applications junk files