Search Engine Watch has posted (http://blog.searchenginewatch.com/blog/) about how a google local search for "booksellers nyc" (http://local.google.com/local?f=q&hl=en&q=booksellers+nyc&ll=40.769622,-73.962021&spn=0.183828,0.31826) will give a couple of results next to pushpins that look like coffee mugs. Clicking on the icon shows a "sponsored ad" for Barnes and Noble with an image.

http://blogoscoped.com/forum/24606.html