On June 11 twitter retired v1 of it's API. You can read all about it HERE. Unfortunately, this has kicked Zeppo to the curb as he was still using v1 via XML. XML is no longer in use on twitter. (RSS and ATOM are dead now as well) JSON is the only applicable format you can use, and every app MUST use SSL (https) THERFORE until the whole script gets rewritten to use the new 1.1 API he will be off twitter. He is still on IRC for your amusement, but I dont expect him to be back on teh twitters before XDAY.
tl;dr: Twitter sux, but Zeppo will return soon