I've been amazed lately at the number of kids I see on my bike commutes out riding longboards, and skateboards in general. My ride takes me through an older-style neighborhood where the majority of the kids seem to walk, bike, or skate to their elementary and middle school. I've been seeing several different pockets of skaters each day lately, most on longboards.
Speaking of longboards, the other day I was in Eastern Board Sports getting new wheels for my longboard, and tried out the CarvStik. Talk about fun! This thing sticks to the turns like mad. You can really put your weight into it, and you can keep yourself going by gyrating as long as your legs can stand it. The most fun I've found with 4 wheels for sure.