Shazam Software makes an application for the iPhone where you can hold your iPhone up in a bar or dance club or where ever, and the software will tell you what song is playing.
An AT and T software evaluator I know was telling me it's correct about 9 out of 10 times.
Being a programmer I know exactly how the program works, but it's still pretty impressive to me....impressive enough that it was the first time I took an interest in the iPhone.
Apparently there's a smart phone version by a different company but my friend was telling me that when AT and T evaluated it, they found it was no where near as accurate as the Shazam iPhone application.
Thanks for the heads up on Shazam software. Just downloaded it, and it works great. Pretty amazing.