WordPress is one of the most versatile content management systems on the market. There are plenty of themes and plugins that let you put a sophisticated site together. Ordering your posts is pretty easy too. What if you want to order categories or tags though? I Order Terms for WordPress has you covered. It lets you reorder categories, tags, and custom taxonomies via drag & drop.
I Order Term is pretty easy to use. Just choose what you want to reorder, and the plugin does the rest for you. The plugin adds a new column to your term_taxonomy table. Once you have enabled the plugin, you can re-order tags and categories via drag and drop.
I Order Terms is designed for developers interested in further customizing their WordPress site. This is a free plugin.