Here’s an extract…
Inbound link quality is the only factor with the same relative influence across the board; Google, Yahoo and MSN’s algorithms. The engines look at a target site to determine the influence and reputation of each inbound link.
“It turns out that it’s actually the quality of [inbound links] than the quantity that wins the day,” said Michael Marshall, VP of technology at Fortune Interactive.
At Google, inbound links rank in the following order: quality, relevance, title keyword, anchor keyword, quantity. Further down the list, site factors such as title keyword, anchor keyword, body keyword, content relevance and title content weigh into the equation.