Currently there are the following Live CD's
-RoFreeSBIE & FreeSBIE
The upcoming PC-BSD 8.0 will be a live DVD
There's a DesktopBSD LiveCD. Though the Project is discontinued now, the LiveCD is still usuable.
Other FreeBSD projects can be found on my FreeBSD systems page
If you're aware of any projects that aren't listed (including any non-English projects), please let me know.
FreeBSD, the unknown Giant. Discover more on freebsdnews.net