We have begun migration of most wikis to our new host, Amazon Web Services. All but the top 100 wikis are in read-only mode until the migration is complete. Estimated completion: End of Week.
Most people participating in the Ace community hang out on the "#wowace" channel on irc.freenode.org
It is a very good idea to log on to the channel when commiting changes to addons, as people will immediately be able to point out potential problems with your commits - all commits are reported to the channel!