Getting a voice communication server.
There are a lot of them but I would recommend raidcall its free support 1000 users and is easy to administrate.
What would change: nothing
How it would change: N/A
How it benefits us: It would enable people to communicate more quickly.
Why it matters: People are social creatures and the more you enable communication the more likely they are to grow in number and time spent.
Problems/concerns involved (if applicable): SPAM!. This can be moderated by taking global voice chat way in the main lounge or setting it to were no members cant talk.
Anything else relevant to your specific suggestion (if applicable): N/A
Using IRC for site chat
I am not sure if this has been suggested or not but it is fairly easy to do. Admittedly I don't know that kind of impact it would have on site performance to add something like Mibbit to the site but
The main idea is you setup a IRC channel on gamesurge for example and them add or build a web base IRC client into the site which with any luck should reduce server load on the site .
What would change: Chat
How it would change: Real time chat view users on the tavern as well.
Why it matters: Again people are social creatures and this would enable them to socialize more quickly.