I would say that the best all time jersey is the La Vie Claire jersey of Greg LeMond and Bernard Hinault. A Mondrian (sp?) design in red, yellow, blue and grey. In '86 they had a battery sponsor, and their backs looked like they had huge D batteries.
Current jersey, I would have to go with last season's Rabobank (this season's is horrible) or Domo.
Worst jersey of all time, Ton Ton Tapis or Tulip. Ton Ton had this black and white strip thing with a guy holding a roll of carpeting on it. Tulip was sea foam green. Geesh.
Current worst would be either Jelly Belly (US) or Jean Delatour, although at least their colors are a bit less harsh on the eyes this season.