Liberty websites that are available:

[RCA]

1) http://www.grassrootsforliberty.com/

2) http://www.libertygrassroots.com/

3) http://www.grassrootsforfreedom.com/

4) http://www.freedomgrassroots.com/

[Austrian Econ Disciple]

I always liked JoinorDie.com I don't think that's taken. If I was to start up a site, I'd use that :p