I've tried FreeSBIE 1.1--I'm quite impressed with what I see, but haven't been able to get the internet hooked up and running (after ifconfig, netstat, etc. ad nauseam)...
http://www.freesbie.org/
http://livecd.sourceforge.net/
I tried it awhile back and it worked quite well. It's the FreeBSD version of Knoppix. I doubt if it's at 6 already, but you never know.