List of Portable software programs that can be run on USB

Here is the list of portable applications,software programs including web browsers,email clients,download managers,IRC clients,P2P clients,word processors and many others useful stuffs that can be run on a USB flash drive.

A definite bookmark which comes in handy.

Bookmark this [wikipedia.org]

Also see this :
List from programurl.com

List from Darlvelvet.com