Damnation!
I've already changed shower shoes, I wear exclusively cotton socks (I like the feel...

), and I towel off between my toes and then wash the towel. Which powder are you using? Mine's brandless, from Boots... I might have to buy a 'special' powder to ensure that it's doing its thing in terms of prevention. My biggest problem is boot discipline. I have two pairs of timberlands which I change between every time I go out, but the leather is somewhat difficult to dry, even on a made-to-measure boot rack. I'm hopefully grabbing some Desert Acadia's by Danner next time I'm stateside (one week: can't wait!), so this might help the problem somewhat.
I'll continue monitoring the progress of the infection. I remember getting a very serious case inbetween my toes at camp, individual pustules were about an inch in diameter. Painful stuff.
Thanks for the help, guys!
Solid