Open API for the community (quite technical proposal)
Open your backend for external applications and websites and allow your community develop applications, which can enrich the experience with the site. Me personally I would love to write an app, which should just sit in my status bar and allowed me to post/answer to messages.
This should not be a big deal and the site would benefit from the additional traffic.
I'd love to aggregate stats using an API like this.
I.e. combined weight of feabians or average weight, etc.