CCleaner Portable is the normal CCleaner program, but it doesn't require installing.
Also available:Download
CCleaner Slim (No Yahoo toolbar)
CCleaner With Yahoo toolbar)
CCleaner is a freeware system optimization, privacy and cleaning tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. Additionally it contains a fully featured registry cleaner. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware! :)
This version has no installer.