I have developed and installed a new plugin, the "Advanced Query" for questions in the PhysicsOverflow database. You may access it at the top right corner of every page as "Adv.Query". Questions may be searched by one or more of the following criteria:
- a category
- one or more tags (all or one of them)
- one or more title-words (all or one of them)
- a range of posting dates
- the poster
- some answer types
The user interface should be self-explaining. Have fun!