Building good solid backlinks is something that can only benefit your site, not only can it assist with SEO, it can also improve your site’s SERPs and it can help improve Google PageRank too.
There are hundreds of sites that offer backlink checking tools, the 8 listed here are top resources as they are all free to use, don’t require and registration and give you a good insight into the backlinks for your site.
Some go into more depth than others, for example Seopro’s and WebToolHub’s tool can show you homepage PR, links count, anchor text and whether the links are nofollow or not.
SEO Logs – BackLinks Analyzer Tool
WebToolHub Backlink Checker Tool
SeoCentro – Link Popularity Check Tool
Backlinkwatch
SEO Chat – SEO Tools – Link Popularity
Submit Express – Link Popularity Check Tool
Webmaster Toolkit – Link Popularity Checker
Seopro – Link Checker
