Community Phone Book / Directory?

Does anyone have any thoughts about how to set up a group or site-wide phone book / directory. In my case it would be to find local businesses, bus and train services, church times, Doctors etc. Of course such a facility should allow space for email address and website info too.

Would this project make for a viable plugin project?

- Tom

Beginning Developers

Beginning Developers

This space is for newcomers, who wish to build a new plugin or to customize an existing one to their liking