With last.fm, I enter my favorite artist, band, or song, and it streams music related to that category. At the surface it sounds just like Pandora, but I believe the music matching algorithm is better, as well as last.fm offers many more features. For example, the module above will play my music recommendations, or you can play it on the last.fm site. These are the songs that match what I have selected. I can also play my recommended songs through a downloadable client.
last.fm uses scrobbing to assist in recommending music.
Scrobbling a song means that when you listen to it, the name of the song is sent to Last.fm and added to your music profile.
Once you've signed up and downloaded Last.fm, you can scrobble songs you listen to on your computer or iPod automatically. Start scrobbling yourself, and see what artists you really listen to the most. Songs you listen to will also appear on your Last.fm profile page for others to see.
In addition, last.fm provides several ways to interact with their music, such as through top charts and tagging. Using the Love feature, you can go back and play songs just from your Love list. Likewise, using the Ban feature, you can ban songs from being recommended again.
This is just a peak at the fun you can have with last.fm. If you haven't already, give it a try.