Zip drive stuff
Portable ApplicationsIf you have a flash or zip, ect, drive, you are half way there. Now you can take Firefox and a bunch of other essential soft ware with you.
Virus scan a friends computer, make a graphic with the Gimp, use Open Office.
Depending on how big your zip drive is, the possibility's are almost unlimited.
http://portableapps.com/ is the place to get them! Have fun with em. I will keep a link posted on the Portable Apps page here.