I've (finally) corrected an issue with the Technorati Rank WordPress Plugin that corrects an issue with the inability to write or open a cache file. I've added a cache subdirectory to the plugin and now store the cached file in that directory.
The plugin still requires PHP5+ (SimpleXML) and the cURL library. If your host does not have the latest and greatest, I would encourage you to upgrade to a new host. You'll find a coupon for a free year of hosting with my host in my RSS feed.
Additionally, I am working on enhancing this plugin with an additional graphics style (thanks to Technorati for some help there!). In all my spare time – of course!