Actually, maybe this part is even better: Many radio stations transmit the names of the songs and bands they’re playing. DAR.fm captures that information and detects song breaks. In other words, if you record a day or so of a music station, you’ve suddenly got a tidy list of songs, identified (and sortable) by title or band. You can listen to individual songs, skip the turkeys and otherwise enjoy your totally free song collection. It’s crazy cool, like a hybrid of iTunes and satellite radio.

You can also listen to your recordings on an app phone, using a free app for that purpose. (The app for iPhone is called Airband; for Android, it’s MP3Tunes; for Windows Phone 7, Locker Player; for WebOS, MP3tunes.) Can you imagine having the last few weeks’ worth of every worthwhile radio show, right on your phone? Sure, subscribing to podcasts achieves a similar goal — but not every show is available as a podcast. And this way, you never have to sync your phone with your computer.

For best results, listen when your phone is in a Wi-Fi hot spot. Otherwise, streaming music will rip through your monthly data allowance like the winner of a hot-dog-eating contest.

Or use the trick described at dar.fm/faq.php. It tells you how to download your recordings, so you can listen to them later without an Internet connection. (Yes, you can even download individual songs that you captured. The record-company lawyers must love that part.)

Image Shows recorded at DAR.fm automatically appear in your MP3Tunes.com music locker, the contents of which are viewable on 30 Wi-Fi radio models, such as the Logitech Squeezebox.

Even more intriguingly, you can listen to your recordings on an actual, physical radio. You know, one of those tabletop things with speakers and knobs. These days, they come with wireless Internet connections — which is all DAR.fm needs to know.

The Wi-Fi radios from Grace Digital ($80 to $200) list DAR.fm right on the main menu. Selecting that source instantly presents your list of recorded radio shows.