Tags are great. They help power a lot of our social networking services like Digg or del.icio.us. The problem that I'm having with them is that they don't always fill the place of categories. I want Blogger to allow me to organize my posts into specific categories. The current design of Blogger allows a poster to assign tags to each post -- to be searched on afterwards. But if I'm a "browser" as opposed to a "searcher", I want to select a category and browse through the posts.
Many people have found workarounds to have categories on Blogger, but why hasn't the lovely people over at Google (who owns Blogger) realized the need for this feature that every other blogging tool has?