We asked 30 experts to questions spread over 9 reverse link analysis and received a response of 20 000 words. This article is part 1 and 3 are part of a series of group interviews of inverse analysis. Part 1 includes an analysis of how reverse - the site and the sites of your competitors because it refers to the campaign of link building design.

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The free version of SEO Spy Glass will get you more than enough info about your own backlinks...

For your competitors backlinks use backlinkwatch.com . If you are dealing with an affiliate most likely they have forums and blog commenting backlinks. You can get them to outrank.

I use Yahoo Site Explorer and Google Webmaster Tools the most, but also found Open Site Explorer handy

Here are a bunch of backlink checking tools that you can use Back Link Checking Tools

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Yahoo site explorer is fast and very good. SEO Moz claims that your Yahoo Backlink count is a better indication of your domain strength/ranking potential than your Google PageRank from their analysis. Open site explorer form SEO Moz is okay, but it seems super slow. For example, one of my sites in the footer is 2 months old. It only has 1600 links by Yahoo. Open site explorer only shows 3 linking domains.