ClearTemp is an application for you to clear temporary/unused files and unused registry keys/values on your system easily. It also allows you to clear your Recent Program List, Internet Address History and boot count. You can even change the location of the temporary folders (Cache, History & Cookies) or e-mail attachment folder to the Storage Card. If you have custom folders which you wish to clear, you can also add them in.
it's free - get it here
http://mobile-sg.com/software/?p=ClearTemp&platform=ppc