Did the geocode operator stop working? I just tried a couple of geocoded searches and got back 0 results. Here is a search for San Francisco, CA within 15 miles.
curl http://search.twitter.com/search.json?q=geocode%3A37.779160%2C-122.420049%2C15m Users are complaining to me as well, so I know it's not just my machine/IP.... Is it working for anyone else? -Chad