Well, whilst looking into the problem with Technorati displaying the HTML content of my posts, rather than the plain text or rendered content, I discovered that it seems to be double-tagging my posts. A quick look into the Atom template show that this is because Nucleus is creating two sets of tags in each entry in the atom feed. This is because I had two entries in the template - one to create '<category>' tags, and the other to create '<a rel="tag" ... >' tags. I think this comes down to me trying to get Technorati to pick the tags up in the first place. Well, fingers crossed there's only one set of tags listed with this post...