Very much like snowboarding, but with some differences in the board, sandboarding opens a new possibility to those who want to turn a nearby sand dune into the equivalent of a snow covered hill to a snowboarder.
Here's a video from the 2007 world sandboarding championship.
Heelys are shoes that have a wheel in the sole. The wheel, being removable, allows someone to wear their Heelys like normal street shoes, and then when they want to ride, all they have to do is pop the wheels back in and go.
Some Heelys even have "grind plates" on the bottom that allow you to grind on rails.
Check out this video of some people having fun with their Heelys...
The Flowboard was designed to simulate the feel of snowboarding and surfing. Traditional skateboards can only carve a 25º turn, while the Flowboard can carve a 45º turn.
The 14 wheel (7 on each side) design of the Flowboard allows it to preform fluid carves from one edge of the board to the other.
The Flowboard comes available in three sizes. Each size offers a different experience than the other.
The 32" Flowboard is a great one for Skateboarders making the transition to Flowboarding. Great for taking to the skatepark, or for preforming skateboard tricks on. Also good for carving down smaller sized hills.
The middle sized 36" Flowboard is well balanced. It's size makes it great for skateparks and carving down hills.
If you are going after the snowboard or surfing feel of carving, the 42" is the best choice. The 42" Flowboard is great for carving down big hills.
Dirtsurfers are well known for their ability to go extremely fast without speed wobble like any normal 4 wheeled mountainboard would get. The fastest anyone has gone on a Dirtsurfer was around 65 mph.
Due to the design of a Dirtsurfer, the faster a Dirtsurfer goes, the more stable it becomes. To slow down, lean back into the calf lever brake and the Dirtsurfer's disc brake will slow you down.
Check out this video of Dirtsurfer riders in New Zealand...