WordPress 2.3 has tags built in, as it was one of the most requested features by users. The default kubrick theme and a lot of others now have a link underneath each post to the category the post was placed in and the tags appointed to the post. Like this:
Combine that with WordPress’s default date based archive, and you’ve got a problem… Mostly because most users will use tags that are similar to their categories, and will post like once a day, creating a post and a date based archive page for each post as well… It’s easy to prevent that, but most people won’t bother, creating dupe content hell. So today’s wise lesson:
Pick one form of archives, and stick with it!