I find Foursquare's app much much superior than all-- too bad they're gotten a confused reputation over the years. But from an app UI/UX perspective, it shocks me why anyone would use Yelp's app over Foursquare.
Twizoo is also a new competitor that takes a completely different approach by getting reviews from Twitter. It also uses a data visualization over lists which is interesting. However, I think it's only live in a handful of US cities.
I definitely can see a use case for this if it had some type of integration with MS word.
Unfortunately I'm currently stuck working for the big corporation, and we have so many meetings reviewing documents, etc over fairly large teleconferences across the world-- so not face to face meetings. Currently, usually only one person drives the edits in MS Word and screenshares with the group via a WebEx or LiveMeeting... if there could be some sort integration with MS Word so multiple people could edit at the same time and view the same thing, there would be no need for the LiveMeeting/WebEx screenshare and the collaboration would be much more seamless. Would remind me of a SubEthaEdit mashed with MS Word.
Twizoo is also a new competitor that takes a completely different approach by getting reviews from Twitter. It also uses a data visualization over lists which is interesting. However, I think it's only live in a handful of US cities.