Hi Steve,
Thanks for sharing!
I was running the trial version of it for a while and was pretty impressed too - although it
was a little bit 'laggy' running on my old 256MB USB drive.
Another useful utility I've been using lately is the Portable Apps Suite. It's got Firefox, GAIM, OpenOffice, etc - but the best thing is that it's totally free!
If anyone is interested you can download it from
here.
On a similar note - and for the more adventurous - it's also possible to set your USB drive up with a bootable linux distro.
To be able to do this you need at least a 1GB USB drive, and a tutorial can be found
here.