baabullah

This is a widget, you can put in the sidebar that display recent played tracks of an last.fm account.
You can set any last.fm username, limit the songs and refresh interval.
This plugin require jQuery on your template. If your template doesn’t support jQuery, this plugin will display your currently played song in image format.

LastFM Now Playing

A widget that display recent tracks of an last.fm account.

Ricardo Gonzalez

Last.fm for WordPress displays your recently listened tracks in your WordPress blog.
Features
<pre><code>* Simply
* Customizable
* Widget support
* No options page (yes, it is a feature)
* Uses WordPress resources (no extra files needed)
</code></pre>
Usage
If you use WordPress widgets, just drag the widget into your sidebar and configure. If widgets are not your thing, use the following code to display your recently listened tracks:
<pre><code><?php lastfm_tracks("username"); ?>
</code></pre>
For more info (options, customization, etc.) visit <a href="http://rick.jinlabs.com/code/lastfm" title="Last.fm for WordPress" rel="nofollow ugc">the plugin homepage</a>.
Credits
<a href="http://cavemonkey50.com/" rel="nofollow ugc">Ronald Heft</a> – The plugin is highly based in his Pownce for WordPress, so the major part of the credits goes to him. 
<a href="http://bohuco.net/blog" rel="nofollow ugc">Michael Feichtinger</a> – For the multi-widget feature.
Contact
Suggestion, fixes, rants, congratulations, gifts et al to rick[at]jinlabs.com.

Last.fm for WordPress

Last.fm for WordPress displays your recently listened tracks in your WordPress blog.

LastFM Now Playing vs Last.fm for WordPress