I have been following the Kelsey Group for years but mostly checking out their research on yellow pages advertising. Like the rest of us, they are now well into search.  Here is some interesting info they have provided for local search:

Online maps, in combination with local search engines, have become very popular in recent years, giving people a way to discover local businesses and attractions, obtain driving directions and view satellite images of an area, among other things. Google competitors like Microsoft, Yahoo, AOL, and Ask.com have made their mapping sites a high priority for development. Advertising revenue in local search engines is expected to grow from $3.4 billion in 2005 to $13 billion in 2010.