I've read through some of the posts here and tested out the firefox3.iso. I've taken a slightly different approach in creating a kiosk environment. You can download the scripts I wrote to facilitate creating a kiosk using firefox at boothbox.sourceforge.net. There's also a torrent available of the iso image I created after I remastered knoppix. I'll be updating the iso image in the next couple of days with some of the changes I've rolled into the latest livecd I've created. For now the image I've provided should provide a good base for people who want a fullscreen web kiosk.