This is so cool, I just had to put up a quickie: yes.com
This site collects the playlists from most terrestrial radio stations in the US, and lets you see information about what songs they play, and most likely what song is playing right now! So if you hear the radio, if you can identify the station, you don’t have to try to guess the song anymore.
Now, that is fantastic, as much so as two of the coolest apps written for the iPhone: Shazam and Midomi. These apps can listen to a piece of music — recorded, sung, hummed, or mangled — and tell you what it is. Then they’ll point you to YouTube videos of that track, or let you buy it in iTunes. Stellar!