One way to get this place cracking even more than it already does is to have a high profile contest. This thread is meant to get some of your ideas and possibly lead to the organization of the contest.
It might even be possible to have a monetary or otherwise real value award for the winner of the contest (so not just the abundant stuff like emails, subdomains and whatnot). The way I could arrange this is to have one of the potential advertising sponsors I have contact with, direct a certain (not too big) amount of money to your PayPal account, if you have one.
But that's not yet assured. Let's just say I'm to seriously consider such an award to spark some real motivation.
It may not be the most original idea, but that's why we have this thread and you. There is no such thing as a stupid idea here, so just post away whatever comes to your mind.