Since bitcoins (http://www.bitcoin.org) are perfect for micro payments (almost nil transaction cost) they are perfect for helping a forum owner monetize his site. While a few users are willing to make $20+ donations through PayPal, enabling bitcoin donations opens up the world of $0.05 and $0.10 donations or even rewarding of posters by other users.
*Note, bitcoin.org is not related to bitcoin.com. It's bitcoin.org I'm talking about.
I would also pay for something like this which lets some kind of bitcoin integration.
Bitcoin is really amazing for forums users as it allows micro donations. This may save forums that cannot survive with adwords anymore. You can accept small donations from users.
What exactly are you guys looking for? What features do you need more then just adding a Donate button that uses bitcoin? Give me some ideas and I may make this.