phranque - 5:25 am on Dec 29, 2012 (gmt 0)

there are several tools sets available for discovering inbound links.

you can find these discussed in the Link Development forum at WebmasterWorld:
http://www.webmasterworld.com/link_development/ [webmasterworld.com]

this thread discusses the 2 major providers of this service.
Majestic SEO / Open Site Explorer comparison by Eric Enge:
http://www.webmasterworld.com/link_development/4477415.htm [webmasterworld.com]

in my experience majestic provides the most useful and comprehensive data.
i've heard good things recently about ahrefs but haven't had a chance to try it yet.