We have been able to follow random tweets by geographic location on a map via Twittervision and Twittermap but other than fun, it isn't that useful in our opinion. What if you wanted to follow all tweets from the city of London, UK. Well now you can. TwitterWhere lets you input a location and a radius (1 mile away, 5 miles away etc). Once you do this, submit your selection and TwitterWhere will create an RSS feed and an XML feed that you can follow in your feed reader.

While we don't have an immediate use for this, many of you will find it handy for sure.

They also have a Adobe Apollo desktop application available too.

Here is a screenshot from their website.