Anyone know a quick and easy way to gather (and vote on?) feature suggestions?

I’m looking for a way to gather feature suggestions, thoughts and such from users and potential users about this project. I’m guessing this is a fairly common need, for start-up software in particular, but so far my web searching has not thrown up anything obvious.

I could write something to do it, but I don’t really want to get distracted by that right now. I’d rather press on with getting the main project in a good state to launch.

Any suggestions or experiences with doing this?