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 (SDK will be available asap).
Cleans:
1. Tracking Cookies
2. Internet Explorer Cache, Hisotry, Address Bar History and 'index.dat' files
3. Outlook Express (only if installed)
4. Windows and Office recent files

User junk files
1. Office Outlook Junk e-mail and Deleted Items
2. Windows Updates uninstallation files
3. Windows Updates orphan uninstallation files
4. Windows temp files
5. Windows Error Reporting files (only for Windows Vista)
6. Internet Explorer 7 Updates uninstallation files

Prefetch files
1. Global system junk files
2. Mozilla Firefox cache and cookies (multi-profiles)
3. Flock Browser cache and cookies (multi-profiles)
4. Third party applications junk files

The license of this software is Freeware, you can free download and free use this disk cleanup software.