SoundHound for Android and iPhone
Audiophiles who have an iPhone or Android phone should do themselves a favor and try out song-searching app SoundHound.
SoundHound (free or $4.99) gives you five ways to name an unknown tune, and delivers the expected artist bios and related video content. It also throws in lyrics, and to its credit, doesn't yank them from the more limited free version.
Our favorite feature, unfortunately found only in the iPhone edition for now, meshes with your on-board iPod to pony up lyrics and bio information for songs you already own.