NO-install.com

Here you will find software applications like Firefox Webbrowser, Thunderbird Email, Trillian instant messenger, Abiword word processor and many more that you can run from just about any removable media such as USB, CD-ROM, Compact Flash, Memory Stick, etc with little to no installation required

At last really something valuable for my USB stick , thanks pepperdepep I am definitely going to use this!