Less than a couple of hours ago the 2011 edition of Local Search Ranking Factors (by David Mihm) was issued. This year the layout is a bit changed, because of the major changes that occurred in Google Places the last October. You can see the ranking factors here:
Local Search Ranking Factors | Local SEO Best Practices for Ranking in Google Places
Additionally, at the bottom you could see the top citation sources due to the contributors, as well as the top review sources.
This year's contributors list includes names such as:
Chris Silver Smith
Basically all the gurus of local SEO and Google Places from all over the world. I'd suggest anyone who considers getting involved (or is already involved) in this particular field to read, print out, pin on their wall over their bed and under the glass on their desk all the tips on an A1 size paper.