Several times on Diabolos I have seen teleport hack bots used for gathering in Mining or Botany. They are always in stealth, and teleport from node to node.
You can mark them with an X or something and watch as they teleport around usually standing in a strange place (well above the node in mining, or floating and sometimes partially in a tree in botany)
see these 2 pics
http://i1179.photobucket.com/albums/...eporthack2.jpg
http://i1179.photobucket.com/albums/...eporthack1.jpg