Google, Yahoo and Microsoft search made a joint announcement that they are going to all support sitemaps .90 - official site.

And what does that mean?

from AjaxWorld:

How Sitemaps Work
A Sitemap is an XML file that can be made available on a website and acts as a marker for search engines to crawl certain pages. It is an easy way for webmasters to make their sites more search engine friendly. It does this by conveniently allowing webmasters to list all of their URLs along with optional metadata, such as the last time the page changed, to improve how search engines crawl and index their websites.

This all sounds like good news, especially for Flash and Ajax developers who have had issues getting their dynamic sites accurately crawled.

What I’d like to know is what safeguards there are to prevent abuse. Guess we’ll find out.