Windows only: Tiny utility JavaRa cleans up older or redundant versions of the Java Runtime Environment (JRE) that might be littering up your PC, and optionally updates to the latest version. It's a simple tool that just works.
Many Java-based applications bundle a copy of the Java runtime or install different versions, but you don't need them all installed, so JavaRa makes it simple to update yourself to the latest version and remove everything else that you don't need. Just run the application — in Administrator mode for Vista or Windows 7 — and click the Remove Older Versions button to start the process. You can also remove startup entries and the Sun download manager as well. JavaRa is a free, portable download for Windows only and should make a great addition to your flash drive toolkit.