Yep, I've been trying out gold bond foot powder for a while-- it seems to help a little bit.
I use running shoes because they dry quickly-- my pack is an external frame so I have the clothesline idea downright good (stringing it over my top bar between, it looks pretty funny-- otherwise I just take off my shoes and socks and let them air as much as possible.
Glad I'm not the only one suffering
I did find that if you're willing and able for it, you can tuck your boots or shoes in the bottom of your sleeping bag at night if they're a bit wet or cold. This goes for socks too. That keeps them fairly warm. I also have a stuff sack my sleeping bag fits into, so I usually turn it inside out and stuff the bag inside when it's wet-- then when it's somewhat dry, I put it back in with regular style and it's right as rain.