just my two cents since i saw something like teamspeak..there are WAAAAY better and sometimes free alternatives..
will comment more later.. still kaput -.- no not from party, -hernia acting up-
Of course. Teamspeak is just the obvious example of which everyone knows what it does.
Mumble is way better than TS and fully Open Source and stupid easy to set up on a server (been there done that).
Concerning Wordpress, I've been hearing lots of reports about security issues with it lately, while I'm not against it (my blog is on Wordpress, but I don't host it myself so security is not my problem) I thought it worth mentioning.
Now things that I feel would be especially useful would probably be a calendar of sorts, if we can use iCal or something to "watch" it that'd be cool and an RSS feed for news so we can see when stuff happens without having to visit the site all the time.