A good thread to start, SRS. I subscribe to both of our local stations and to two internet stations (Folk Alley and WFUV ). The former is 24-hour folk music. The latter is of note, besides for its programming, for the fact that they archive for several weeks, so you can go back and pick up programs you missed.

Another good source for stations is PublicRadioFan.com...they have links to public radio stations outside the US, and the page includes an upcoming program schedule for each - which isn't always accurate, however.