Yahoo is embracing semantic web standards / microformats…
Yahoo Embraces The Semantic Web – Expect The Internet To Organize Itself In A Hurry: “What does all this mean? It means we can expect the web to get itself organized, in a hurry. At stake is a significant amount of traffic from Yahoo search, and anyone else that may choose to build applications on top of this data.”
In other words, all those random social networks and places of content creation that you have joined or participated in (MySpace, LinkedIn, blogger.com, etc) are going to be more easily incorporated into Yahoo search because the data will be properly structured on the backend.
This is huge and has been a coming avalanche one snowflake at a time.
Hats off to Yahoo and all the open standards evangelists like Chris Messina that have made this happen.
Updated: Marshall Kirkpatrick has a great piece about what this all means on RWW