Good thread. I know that they can cost a little more, but spending the extra money to get any type of moisture wicking underwear is worth it. I prefer boxers for everyday wear, but for Disney and long hours at the soccer yard, I prefer the moisture wicking boxer briefs. Wet with sweat or wet after the typical Disney afternoon monsoon, they dry quickly. I also try to pair with some moisture wicking shorts. A couple of pairs that I've found very rewarding are the Columbia and Under Armor brands. They're dry in minutes after being caught in a rain!
Some of you have mentioned body glide - that's an awesome product. Like others on this thread have said, it's great on the bottoms of your feet!