After receiving positive feedback from the Starwood maps (see this FT Thread), we released a similar page with Hilton Interactive Maps and have now done so for Marriott hotels:

MARRIOTT Interactive Maps

How it works:
1) Enter all or part of an address in the text box and select a radius to search by. Click GO.
2) A map will then appear centered on your location, and all Marriott branded hotels within the radius you selected will be shown on the map
3) Put your cursor over a hotel marker to see the name of the hotel. Click a hotel marker on the map to see additional information about the hotel and for a link to check availability

This is an extension of the BetterChecker website which helps users search hotel rates across multiple brands, so this seemed like a natural fit for users who were specifically interested in just the Marriott brand of properties.

Any feedback is welcomed and if anyone has a suggestion, finds a problem, mistake, missing hotel, etc, please let us know.