Yahoo Site Explorer

Yahoo just unveiled Yahoo Site Explorer, which "allows you to explore all the web pages indexed by Yahoo! Search. View the most popular pages from any site, dive into a comprehensive site map, and find pages that link to that site or any page."

And more from the official Yahoo Blog:

"Currently, you can use Site Explorer to:

• Show all subpages within a URL indexed by Yahoo!, which you can see for stanford.edu, here. You can also see subpages under a path, such as for Professor Knuth’s pages.
• Show inlinks indexed by Yahoo! to a URL, such as for Professor Knuth’s pages, or for an entire site like stanford.edu.
• Submit missing URLs to Yahoo!

Site Explorer is geared towards your needs, providing 50 results by default, web services APIs, the ability to export the data to a TSV file (that's a file that you download with tab separated vaules - I for one think that's VERY cool) for further analysis, as well as free submission for missing URLs."

Honestly, this is something you can do quite easily from most any search engine, but the way that Yahoo Site Explorer has got it set up is pretty cool. Here's a few search operators to explore how your site or any other site is doing:

• link:http://www.websearch.about.com will list all the pages that link to this site.
• site:websearch.about.com Yahoo: Restricts search to just this site, only about Yahoo. Make sure you put a space (but only one space) between the .com and the query, else it won't work.
• cache:websearch.about.com will give you a snapshot of what the page looked like the last time it was crawled by search engine spiders.
• linkdomain:about.com finds all pages that link to this particular domain. This one only works with Yahoo the last time I checked.