While doing a search for hotels in Paris on Google Maps, I noticed paid advertisements on the map in the form of custom placemarkers with hotel logos. Obviously, Google is looking to produce more revenue from its very popular mapping service, but I hadn't seen this before.
A quick search for hotels in New York shows that this is common across all the Google Maps sites.
Nelso uses Google Maps for its search and business detail pages. Will these ads start showing up on our Google Maps when a user searches for a hotel in Copenhagen or Prague? The Google Maps Terms of Service certainly allow for it ("Google reserves the right to include advertising in the maps images provided to You through the Service"), so it's probably only a matter of time.