Why doesn't the GPS/Near Me functionality work?

If you are on iPhone OS 4, from the iPhone home screen go to Settings > General > Location Services and you should see a list of all applications that make use of the GPS. Is the Good Beer Guide Mobile in this list? If so, it should have a toggle switch to enable/disable the GPS permission, make sure this is set to enabled.

If you are either not on iPhone OS 4, the Good Beer Guide Mobile application is not listed or it is already set to enabled in the Location Services menu, then you should try deleting the application and reinstalling it from the AppStore. When the application starts up after reinstalling, it should ask you for permission to use your location, make sure to press 'Yes'.