...site in the dashboard (provided you verified its yours) and view Diagnostics -> Web crawl -> Not found. Next to a given unfound URL " say, http://example.com/archive%3E " you can click the pages link to the right, which pops up a list of sites referencing that URL*. Often the link is just malformed and the error wont be on your end.

Googles Matt Cutts argues that this new feature may allow you to get what amounts to a free backlink " because you can ping the wrongly-linking webmaster and ask them to correct their link URL. This kind of work only seems to make sense for major backlinks though, so it would be more useful with indicators of the traffic the broken page gets, or the sources PageRank.**

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