I’ve been working on some customizations to my Textpattern installation. I’ve installed a plugin that allows for more than the default 2 categories. I like using multiple categories over tags. If you click on a category link, you’ll be taken to a page that shows all the posts for that category.
I also found some instructions at Jon Hicks’ website for putting del.icio.us links in the sidebar. I think there is a plugin for this, but I used his instructions and it was pretty easy. I may look into the plugin at some point for future reference, as I hope to someday in the near future redesign the site. I just have to decide how I want the layout and look to be.