Last.fm Widget
This widget shows, up to you, top albums, top artists, top tracks and friends list from your Last.fm profile (uses AJAX to request xml from audioscrobbler services preserving page loading without freezing)
Tested on Wordpress 2.3.1 and 2.3.3
Require: php5 and simplexml functions installed.
Download here: lastfm-widget-1.0.rar
Install as plugin, go to Presentation-> Widget, drag and drop Last.fm Widget in your side bar, configure it inserting your Last.fm username and choosing what kind of content you want to show, save and visit your home page 
You can find an example on my sidebar.
History
- 0.5 : First release
- 1.0 : Bugfix and audioscrobbler xml ajax request
