who has used Google Places?

[Warner Onstine]

Hi all, just curious if anyone had used Google Places, Foursquare,
Gowalla or FootFeed to do any location-based stuff? I want to start
adding this in to our application and was looking for plugins. I found
these:

Location - http://www.grails.org/plugin/geolocation
https://github.com/IntelliGrape/Grails-Google-Map-Plugin

Thanks in advance.

-warner