I've created an 'official' Bitcoin bug/issue/feature request tracking system at:
https://github.com/bitcoin/bitcoin/issues
The github issues system has a simple voting system; lets use it!
And if you see an issue that you want to work on, use the commenting system to let everybody know you're working on it. I'd like to be open about who is working on what, and what features/bugs/issues people think are important.
However... we'll still be very conservative about what changes make it into the official bitcoin client. Bitcoin will be destroyed if people using it lose their trust in it.