I wrote several times about
nice solutions for portable applications in my blog including the
solution that U3 offers. The problem - if you see it as a problem - with U3 is, is that it is a proprietary solution that only comes pre-installed with certain USB sticks. Well, John T. Haller, the developer behind numerous portable applications (like Portable Firefox and Portable OpenOffice.org), has come up with his own portable U3-clone that is actually open source! It's briljant! PortableApps Suite is a collection of portable apps including a web browser, email client, office suite, calendar/scheduler, instant messaging client, antivirus, sudoku game, backup utility and integrated menu, all preconfigured to work portably. Just drop it on your portable device and you're ready to go. Sweet! Just head over to his website
PortableApps.com and give it a spin on your USB-stick!