Fred Wilson pretty much announced that the status quo was over for Twitter API developers in an article published last April, "The Twitter Platform's Inflection Point": http://avc.com/a_vc/2010/04/the-twitter-platform.html
Notable quote:
"I think the time for filling the holes in the Twitter service has come and gone. It was a great period for Twitter and its third party developers."
Notable quote:
"I think the time for filling the holes in the Twitter service has come and gone. It was a great period for Twitter and its third party developers."