Theming taxonomy nodes? Is it possible to theme a node based on taxonomy the same way you can theme a node based on its content type (something equivalent to node-news.tpl.php for example) or do I need to organize my content by content type to achieve this?
You can add new "template suggestions" using a preprocess function. Here's an article with more details.

Here's another example, but for different templates based on the vocabulary, rather than the term.