Free, open source disk encryption software TrueCrypt allows you to secure your thumb drive (among other things) so that you don’t need to worry about losing sensitive information if you lose that little drive.
Main features:

Creates a virtual encrypted disk within a file and mounts it as a real disk.
Encrypts an entire hard disk [...]

Windows only: Free program Process Explorer, by the good people at Sysinternals, is a Windows Task Manager replacement tool with all kinds of added functionality.
Ever wondered which program has a particular file or directory open? Now you can find out. Process Explorer shows you information about which handles and DLLs processes have opened or loaded.
The [...]

Do you wanna have Vista Interface without actually having Windows Vista… Well This utility do this for You.
NOTE: This program changes/updates potential system files… Please Read the ReadMe file and understand what you are doing.
Vista Inspirat Shell Pack is a complete custom shell pack for all Windows XP. It consists of modified icons and a [...]