SoundHound ∞

And there’s more: Listen on startup and geotagging options, Facebook and Twitter sharing and optional auto-sharing, previews, iTunes and Pandora links, full length YouTube videos, and your favorite artists’ top songs, bios, and Wikipedia pages.

Requirements and notes: SoundHound works on the iPhone, iPad, new iPod Touch, and second and third generation iPod touch (with an external microphone such as in Apple’s iPhone headsets). Fast network connections, common on WiFi and 3G, allow SoundHound to produce the response times shown above.

Free for a limited time, get it here!