Microformats
Microformats are little snippets of information that are semantically tagged so you know what they are (or at least what they purport to be). There’s a pretty good introduction here, and the “official” site is here. The first browser, I think, to make use of microformats is Firefox, via the Operator extension.
I don’t think much of the name “microformats”, as it doesn’t imply much about what this technology does — at least it doesn’t to me. Information identified with semantic tags can be aggregated from many different sources. As long as the tagging is consistent, of course.
It seems to me the jury is still out about whether microformats are going to prove generally useful — which is to say, whether they’re going to be generally used. I think they certainly could be useful, but the key is widespread use. Take a look at microformats.org; there’s a lot there. If it fires your imagination, get busy!



Recent Google developer podcast announced that Google Maps will support microformats. One might venture a guess that this will drive adoption.