Mike,

Interesting thread. Right down my line of work. I will say not all search engines are equal though. Quite a few still do not use bots and expect you to apply to them to attach your web site to their search engine. Yahoo being one of those (excepting the fact Yahoo is not technically a search engine).

I'm am curious whether these are meta tags or some kind of new tags.

Understanding this technology is certainly an opportunity to better market the web site.