Looks like the NeoCat web app is more stable now. I believe the author added some additional limiting code that should help keep the tweet hogs at bay.
BTW, I grabbed the arduino-tweet code from Github and attempted to stand up my own instance on Google AppEngine. Unfortunately, I am missing some critical clue (not a Python expert by any stretch) as I am getting "token not set" errors which seem to indicate that I am not successfully passing the Twitter Access token from Arduino to Google AppEngine, or I am overlooking some permission(s) I need to run the app on that platform. Will keep trying as it would be a good thing to know how to set up and operate such a service.