It's always fun to see birds and birdwatching promoted on sites that have a broader audience than a birder specific source. On National Public Radio Scott Simon interviewed Don and Lilian Stokes about their new bird guide. While I personally don't think of this large volume as a field guide it is done well and includes a nice CD of vocalizations.
The radio piece is about 9 minutes long and along with the interview NPR has placed a little bird quiz that asks you to match calls to pictures on it's site. I think this would be fun for beginners and especially great for kids to try.
The quiz is found here.
With winter setting in this is the time to work on learning those calls so that next spring you're ready to go.