MOmann

This plugin allows you to easily display your last.fm info on your blog. There are currently 7 different things to display: cover art of your latest tracks, your friends, shouts on your profile page, coverart of your loved tracks, your user info, your most listened to albums and most listened to artists. All of these can independently be disabled or enabled.
Furthermore the plugin includes support of Sean Catchpole’s idTabs jQuery plugin which displays all the information in some nice looking jQuery tabs and some stylish hover effect for descriptions. 
See http://www.sunsean.com/idTabs/ and http://buildinternet.com/project/mosaic/ for further information.
Please let me know if there are any problems or feature requests.
<h3>Translations</h3>
A german translation is included. If you want to translate this plugin in your own language, feel free to use the provided .po-file.

Last.fm Tabs

Displays Last.fm cover art, friends, charts, shouts, loved tracks and user info.

kylehotchkiss

So do you want the world to know what you just listened to? Do you want to show it off in your… WordPress sidebar? I know I do! What Last.wp does is 
show a few of the songs you just scrobbled over to Last.fm. It stands out beyond the other choices because it does it’s dirty work in Javascript (which can speed up 
your server, because it doesn’t have to make request over to Last.fm every page load, rather your Guests computer does it). It displays album artwork, the song name, 
the artist name, and the album name! Your guests will be AMAZED when they find your recent obsession with Conway Twitty! They’ll gasp in awe when they see how much you 
played the beetles within the past five minutes, and their jaws will drop when they see you’ve been spinning N-Sync albums! Wait no longer, your guests can be amazed today!
On the technical side, Last.wp is powered by a small plugin provided by the kind people over at Engage Interactive. (Thanks for providing it under the GPL guys!). Unfortunatly, 
it requires each person to have their own API key as of now, due to Last.fm’s confusing API system. It’s easy to get one, you just login and go to the API screen, create a new 
application, and Voila, your very own API key! (Consult the Instructions for details)

Last.wp

Last.wp is a Wordpress widget that shows your guests what you've been listening to on Last.fm, via a jQuery plugin!

Last.fm Tabs vs Last.wp