The Pandora app is getting some buzz right now, but this preview of the Last.fm iPhone/iPod Touch app looks pretty cool.
Looks like you can:
<ul>
<li>Listen to radio</li>
<li>View your charts</li>
<li>Love and ban tracks</li>
<li>Send recommendations to last.fm friends and anyone in your address book</li>
<li>Buy right from the Mobile iTunes store</li>
Last.fm iPhone Demo from Toby on Vimeo.