TwitterLocal used to watch the Twitter public feed, caching all Tweets with a valid location. People were able to generate feeds from this site based on location, as well as use the TwitterLocal AIR client to subcribe to location feeds.
Now that Twitter has a location-based search API, it doesn't have to cache the posts anymore. So now, TwitterLocal is going to be purely an Adobe AIR-based application that allows you to filter Tweets by location.
Requires Adobe AIR version 1.5.