This plugin shows a typical tagcloud from the stored data of a last.fm user. It has been added a new features and you can now select the kind of tagcloud that you wanna show. See help section of the plugin for more information.
Connect TXP with Technorati
There are at least a few plugins out there designed to better connect Textpattern powered sites to Technorati. This one just uses categories, or multiple custom fields if you need more than two tags on an article.