With several hundred questions going on our public marketplace at any given time, I'm not sure this new feature has that much utility, but for marketplaces that only have a few dozen questions, this will likely come in handy.
We've built a new search filter for questions to show which you are NOT participating in yet. So if you're the kind of person who wants to be involved in every question, we've just made it easier. :)
Enjoy your Labor Day weekend!