Instructables
Skateboarding is an great sport. It's not only a lot of fun, but it's also great exercise. Instructables has a bunch of awesome projects and how-to's about skateboarding. There are the basics, like learning to take a fall. There's also the more advanced, like building a motor powered board. No matter what your experience (or inexperience) is on a skateboard, there's a project for you to check out.