Music geeks and Android lovers, unite! Last.fm is a great application, across the board. If you already have a Last.fm account, you simply sign in to jump to the service's homepage. If you don't have a Last.fm account, setting one up takes only a minute. The homepage has tabs for Artist, Tag, and User, plus a search bar. I did a search for the Pixies, and almost immediately Frank Black's voice started coming from the speakers.
When Last.fm played a Sonic Youth song, the upper-right corner of the album artwork displayed a banner that said "On Tour!" The On Tour button leads to an artist bio, a similar-artists tab, tags, fans, and events. The events info lists all nearby shows that the artist is playing, as well as the dates and venues. Intuitive and classy--I like that in an app.
The Radio tab holds all recent stations, as well as a list of recommended artists plus popular artists in your neighborhood. Your Profile tab will show your top artists, top albums, top tracks, recently played music, events, friends, and tags.
I enjoyed playing around with this app (which performed nearly flawlessly), and I kept finding pleasant surprises in each new feature. For instance, Last.fm has background streaming, so you can listen continuously while using other features of your phone, and you can purchase songs from Amazon directly from the app. Though I missed having a pause button, I probably could have kept Last.fm running all day--if only the speakers on my cell phone weren't so tinny.