Link Popularity

You may wish to know how many others value your site sufficiently to put a link from theirs to yours. Here's how to do it:

Alta Vista Type "link:your URL"

Google: Type "link:your URL" or go to advanced search.

Hotbot: Go to "Links to this URL"

Link Popularity: this is a meta search engine that does Google, Alta Vista and Hotbot in one go.

Webquotes
Another approach from Google, giving apparently more hits than the "link" feature described above. Google WebQuotes annotates the results of a Google search with comments from other websites. This offers a convenient way to get a third party's opinion about each of the returns for your search, providing you with more information about that site's credibility and reputation.