From Scout:

I think it’s too early to make a judgement but this isn’t good. Floyd Landis tested positive on his A sample from Stage 17 (yeah his phenomenal comeback stage)

The Phonak team has confirmed the speculation that Floyd Landis returned a positive A sample after his win in stage 17 of the Tour de France. “The Phonak Cycling Team was notified yesterday by the UCI about an unusual level of Testosterone/Epitestosterone ratio in the test made on Floyd Landis after stage 17 of the Tour de France,” said the team in a statement. “The team management and the rider were both totally surprised of this physiological result.

Results from a confirming B sample are not in yet.