The portable version (i.e. runs off a flash drive and doesn’t touch the local computer’s hard drive) of OpenOffice.org 3 is now available for downloading. If you haven’t tried it yet, you officially have no excuse.
"OpenOffice.org 3 is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It is available in many languages and works on all common computers. It stores all your data in an international open standard format and can also read and write files from other common office software packages. It can be downloaded and used completely free of charge for any purpose."