We're at the beginning of a hopefully long, long journey. Right now, a handful of tags have been created. I'd like to ask everyone to please edit the tag wiki (excerpt) so that there are some guidelines about when to apply them. This way we will have a discussion basis, if (or when) we need to merge, or split tags. Tags are one of the big pillars of the SE system, if we start strong, we'll have a better stand in the long run. It'll make the transition into open beta a lot easier (hopefully).
Tags won't be set in stone, they can be quite fluid, even after graduation, but getting a head start will be good.