Disk Cleaner is a free open source tool to quickly and easily clean your hard disk from temporary files like those in the system temporary folder, the Internet Explorer Cache and Cookies folder, and the Recycle Bin.
http://www.diskcleaner.nl
this isn't as good as ccleaner or anything but it's the best open source temp cleaner.
Changes:
Dev Test 3: changed icon to the better one Zach made
Dev Test 2: changed ugly icon with less ugly icon based on image from their website
Disk Cleaner Portable 1.5.7 Development Test 3 550 KB