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Linker's Domain

The number of referring domains is one of the most important ranking factors in Google's algorithm, as you can see from this industry study of 1 million Google Search results.

The authority and trustworthiness of the referring domain determine how much “TrustRank” gets passed on to your site.

Backlinks from aged domains may be more significant than those from newer domains. Additionally, according to a Google patent, older links have more ranking power than newer backlinks.

Links from separate class-C IP addresses (unicast addresses in the range 192.0.0.1 -- 233.255.255.254) suggest a wider breadth of sites linking to you, which can help with rankings.

Matt Cutts has stated that the TLD (top-level domains such as .edu .com .net .org) doesn't factor into a site's importance. Google said they “ignore” lots of '.edu' links. However, many still think that there's a special place in the algorithm for .gov and .edu TLDs.Getting links from country-specific top-level domain extensions (.de, .cn, .co.uk) may help you rank better in that country.

A site's reputation on certain sites like Yelp.com probably plays a role too. Google posted a candid outline of how they used online reviews after one site was caught ripping off customers to get press coverage and links.