This question already has an answer here:
On Super User; @IvoFlipse was looking for a query to find old unanswered inactive questions with low views/votes. Because those kind of questions clutter the site and keep the unanswered question ratio high, it is a good idea to keep the site clean from questions like these.
It's very unlikely that someone that asked a question (about a problem) that has been inactive and not popular for more than a year, will still be very active and have the same problem now.
So, we worked on a query to find such questions. As flagging doesn't allow mass deletion, we opened a meta question on Super User where we can list such questions. As this seems a nice idea, other SE 2.0 communities might benefit by doing the same; feel free to discuss safe limits for this so that @JeffAtwood might be able automatize this...
Until now we've been doing this manually to ensure we don't prune questions of high quality.