Favorite Portable USB Programs?

[Greg]

I am looking for some nice portable programs for my USB Flash Drive.
What are some of your favorites? (I've already tried Firefox and Thunderbird)

 

[furtivefelon]

i have filezilla.. though, it could cause problems when OS assign different drive letter to your usb drive..

othe than that, i don't use usb drive that often :|

 

[macdude425]

I love Portable Firefox and Thunderbird

Other than that, my USB drive is mainly used for taking files from place to place, then deleted.