Yesterday I checked out the new Apache Tika project. The project (which is still in incubation) is able to extract metadata from various file formats. The API is pretty straightforward.

I made a quick and dirty implementation of a property age so you can see all metadata of any resource (supported by Tika) in your workspace in the Properties dialog. Nothing fancy, but it works.

I'm not sure it is really worth the effort make the source code available. Maybe I'll set up a Google Code project when the Tika project matures a little bit.