This presentation revealed some interesting changes from previous years so I've decided to summarize some of the major takeaways below.

Page Specific Linking Factors

1. SEO experts believe the power of links has declined somewhat.
2. Diversity of links has a stronger impact on rankings compared than the raw number of links for any page.
3. Partial match anchor text now appears to have a stronger influence on rankings. There is speculation this may be related to Google's panda update which devalued overly precise exact match anchor text.

Domain Level Ranking Factors

1. While Google still ranks content on a page level, domain ranking strength has become more important after the recent panda update.
2. Exact match domains have not performed as well as previous years. There is speculation that Google has devalued it as a ranking factor.

On-Page Ranking Factors

1. Larger/Longer documents tend to rank better (they usually have more content).
2. Long Titles and URLs are bad for SEO
3. Data suggests that using keywords earlier in content and links helps to improve ranking.

Social Ranking Signals

1. Facebook and Twitter popularity is strongly correlated to a strong performance in search engine rankings.
2. Facebook appears to be more influential than twitter

A full report of the 2011 ranking factors is scheduled to be released in May which will provide a lot more data and analysis on the points mentioned above. We will be sure to discuss and share the full report as soon as it's released.