I just finished a perl script, based on a script by Adriaan Tijsseling, that grabs from the Recently Played feed (mine was empty) to create a cloud of artists from last.FM's XML feed of most played artists. You can see the script in action at the bottom of the right hand sidebar of this page.

You can get the script here. You will have to rename the file with a .pl extension, change 'relevante' (my username) to your lastFM username, change the user agent on line 3, set your domain on line 4, and set the file path on line 5 to point to an appropriate directory on your server. Then run the script on a cronjob and include the output file in your blog or webpage (if you are using PHP, you can use <?php include("/path/to/thefile.txt"); ?>). Then everyone can see all the crappy music you REALLY listen to.