I've started tagging my posts, and there's a new tag-cloud at the top of the sidebar. I'll use it as a way of sub-categorizing posts without actually creating new categories. Once it's been in use for a while it will be useful for searching too.
Another recent update to the site is the list of WWW-links in the sidebar ("Anders' Web tips"). It's an RSS feed of the links I mark as 'shared' in google reader. Hope you like them!