I wonder if Technorati is using the RSS feeds, when available for sites, and that’s why my Technorati tags are being ignored? I’ll try a couple of tags in this message body and see.

Update: This is indeed the case: Technorati uses the RSS feeds and reads the tags from the body of the message– so the plugins that add content which is only displayed in the visual pages (like the Textpattern plugin) won’t feed the Technorati tag engine.