Song Tapper is magic. Just tap out the rhythm of a song on your space bar, and it guesses what you are thinking of. Perfect for all those times when you can hum a song but can’t remember the name.
Pandora is a similarly useful bit of fun. Tell it an artist or song that you like, and it instantly puts together a radio stream for you based on that, which you can train. It’s wonderful, created by impressive-sounding Music Genome Project.
And they’re both, of course, free. I do love this Internet thing.