I was wondering if anyone else noticed Yelp pages suddenly taking position one in SERPs they watch. "your-city web design," "your-city dui lawyer," "your-city donate clothes" are examples of what I'm seeing. The latter case was brought to my attention when a client told me Yelp had been in to her office to solicit business. I went back to the office to find it held the first 5 positions in the search! Basically everything above the fold.
I also noticed, that sites that have been advancing seem to be those with Yelp reviews.