I used to run something called "Carnival Of The Libertarians", where various bloggers could submit their liberty-oriented posts for linkage and commentary every month.
It was fun at first, but once this site started getting a decent number of hits, the spammers turned it into a burden.
Mr. Devil's Kitchen has taken up the cause. Go here for The Devil's Kitchen "Libertarian Roundup".
Anna Raccoon, Rab, and The Cat Counters make the final cut.