They are an excellent way to carry your favourite programs with you on your USB key (or other portable method; I just prefer that). I love Firefox Portable, which is just want it sounds like. I've also got FileZilla Portable, Portable GIMP, Portable OpenOffice.org, and Portable Gaim. :jay: Although I haven't figured out how to use it at school yet (and might not be able to, thanks to the restrictions they put on the computers), it's useful for anywhere else that I don't have my computer with me.
I wub Portable Apps! :wub: