I personally have PSPad on my usb stick as I do a lot of my PHP work in work. I also have XAMPPlite on there (Apache, PHP and MySQL) along with Firefox portable. For testing page design. I was thinking about Opera USB as well but it looks a bit dubious.
-- Carbonize <http://forum.pspad.com/read.php?2,34116,34120> PSPad freeware editor http://www.pspad.com
