Interesting read about Google boost.
Clears up and explains some of what is going on.
"Pros/cons
Benefits:
- Local Results are highlighted on the page and are now more visually obvious than general search results
- Generic directories are pushed down in the SERPS leaving more local results above the fold
- The map floats down the page, not always adding context but always reminding folks to think local
- Ranking, which is always the most interesting to folks, appears to favor local businesses
Negatives (nothing too surprising here):
- Businesses that had two mentions on the front page will now have one
- If a business doesn’t yet have a website they will likely loose out on local search all together
- If they have a poorly designed website with flash or a welcome page that masks the site they will loose standing
- More opportunities for a searcher to visit something other than the business website"
http://blumenthals.com/blog/