Definitely keep your clothes clean. Also take good care of your mouth piece, I soak mine in Anti-septic (such as Listerine) for about 30 minutes before I put it away back in the plastic case (make sure you have a bag or something clean, safe to put your mouth guard in).
Athletes foot. I am not sure that you would be under a huge risk for getting it, especially if you are taking showers after training.
That's about it for me, but I am defnitely looking forward to this article. I carry around Anti-bacterial with me religiously (in and out of the gym, grocery stores, gas-stations, etc).
"It is human nature to find an easy way of doing things. Nothing can take the place of hard work." -Dan Gable
Iowa Wrestling Coach