Rodney Harrison was voted by his fellow players the dirtiest player in the NFL. His interview is here.
It should be pointed out, however, as it is in the magazine when they report the results, that the poll was conducted before the start of the regular season, and therefore before Titans defensive tackle Albert Haynesworth pulled the helmet off of fallen offensive lineman Andre Gurode and kicked him in the face, meaning that incident was therefore not taken into account in the voting (and I'm sure there are many others).
Also according to the report in the mag, the next-ranked "dirtiest" players received far more votes within their geographic area; Harrison also didn't play for almost the entirety of last year--basically making it a survey of offhand questions asked of football players before any games had happened this season, to which they gave the first answer that popped into their heads.
Football players: not a high concentration of MENSA members among them. Nor are there too many, I would wager, who would want to waste much time thinking about an SI.com players' poll. This is news?
Also, it should definitely be noted that among the players surveyed, Tom Brady got one vote.
Someone should've said to that guy, "Come on, Peyton, that's embarrassing."