Sites featuring Saving
Yellow Pages Canada saving and sharing functionality is combined and provided by Agendize.
The only thing I could do was "Save and Invite Friends" which at least was half of what I wanted to do.
Google Maps supports saving not to lists or collections but directly to user-created maps. This serves to provide a clear organizing principle that's differentiated. Not sure why you would store a plumber or landscaper on the map but those will be the exceptions.
Google Maps version of a Detail Page is centered on the Fly-Out. Minimal relevant content and functionality is provided. Name, Contact, Photo (if available), Web Site, and Directions, Find Nearby, Send to Phone and now Edit.