London Coffee Map
I've started playing with the Places Library in the Google Maps API.
One feature of the library is that it lets you load venues that match a particular name. I've used this feature to show the locations of cafes belonging to the bigger coffee chains in London.
The London Coffee Map lets you find cafes run by the Monmouth Coffee Company, Starbucks, Costa Coffee and Caffe Nero. If you click on a marker you can view the cafe's Google Places rating and its telephone number.