This tool will query all the major search engines (Google,
Yahoo, MSN, Alta Vista, and AlltheWeb) when you enter the
"site:" operator with your chosen URL. It will return the total
link count for each URL.
You will notice that the totals vary greatly from search engine
to search engine; this is because the figures shown represent
the number of links that are crawled by that search engine
(which will vary based on the size of their database).