If you've got some link suggestions, send email to email@example.com
Other OTR Sites
I'm not going to maintain a list of OTR site links. This isn't because I don't think other sites are worth linking to - quite the contrary. It's just that maintaining links (ensuring they remain accurate) is nearly a full-time job. There's already an EXCELLENT repository of such links, called the Old Time Radio Link Society. Click on "Discussion Board" in the panel on the left, then scroll down the main menu and you'll see a set of links to the Society. They keep things fairly up to date and do a far, far better job than I can.
If you've got a site you want to advertise, I'd advise ya to sign up with the Society. You're also quite welcome, as some already have, to post a note in the Discussion Board itself letting people know about your site.