PortableApps Suite 1.0 stocks your USB drive, portable hard drive, or any other drive with a full complement of software, ready to run wherever you plug in. This latest version includes the latest portable copies of Firefox, GAIM, and OpenOffice. The regular version will take up about 260 MBs on a flash drive. The lite version around 105MB. The difference being Abiword is substituted for Openoffice.
Check it out here.