I just came across PortableApps.com and was amazed by what I found. I have no idea how I have never heard of them before now!! (It has been around since 2004.)
http://portableapps.com
PortableApps.com is the world’s most popular portable software solution allowing you to take your favorite software with you. A fully open source and free platform, it works on any portable storage device (USB flash drive, iPod, memory card, portable hard drive, etc). With millions of users all over the world and a full collection of open source software as well as compatible freeware and commercial software and partners in the software and hardware industry, PortableApps.com is the most complete solution for life on the go.
Regards,
Roger Lacroix
Capitalware Inc.