Thanks all for the advice. It's nice to be getting tips from the two fastest people to ever do this race. I'd be an idiot not to listen. Thanks Pete and Mike.
Got some new shoes today that I feel very happy with. Got out for a short run with them and wore them at work all day. They're Brooks Adreneline GTS 7 and unless I have some drastic problems with them in the next week they'll be the shoe I'll be wearing as I head out of Knik on the 24th. They are a full size big on me and comfortably fit 2-3 pair of socks. I also have neoprene overboots that fit nicely over them. With this setup I'm pretty sure I can keep my feet warm (as long as they are dry) in any temperatures I'm likely to encounter. I'll also have a few pairs of chemical foot insoles with me if needed.
I also bought about 13,000 calories of fat today which I plan to eat (in addition to my already increased food intake) in the next week. A gallon of ice cream; pound of bacon; 8 donuts; and 12 individual frozen pizzas. I ate two donuts after lunch, 2 pizzas just now, and I'm about to dip into the ice cream before bed.
I also received some silicone hose that I ordered in the mail today. This will replace the rubber hose I'm using for shock absorbtion on my sled. Silicone is rated to be flexible and durable down to 65 below and I was able to get two sizes which fit snugly inside of each other to increase strength. I've got a 3 day weekend coming up in which I can test out my sled some more, weed out unneccasary gear, and eat until I can't move. Should be fun.