For me, at least - the feeling that "we're actually going to do this" is just now setting in. With that in mind, I actually looked at all the links, etc that were discussed below. I also found a few others that I thought were interesting:
http://www.sentai.com/mudhounds/intro.htm (a great trip recap - I didn't realize the trail could be so crowded)
http://legrandbleu.swissworld.com/frameset_wcte.html (another recap - not as lengthy)
http://www.i-needtoknow.com/pop/gear.html (a very thorough gear list)
After reading these thoroughly, I've determined I'm going to purchase gaiters and a backpack cover (to double as a waterproof sack) - but skip the poles (which I've never liked hiking with). Any other "must haves" that people are considering?