Walden iPhone Exposure: #1 apps in both free and paid music category
Pandora #1 free music app
Midomi #1 paid music app
And they happen to be highly complimentary. Pandora to easily consume music you love with it's one click radio format; Midomi to easily search for samples and info on specific songs/artists you know OR identify music you are hearing.
Very different models and visions of the future, but both are making consumers really happy and powered by some incredible technology and entrepreneurs. iPhund?