Downhill - Downhill is like freefall; something to be experienced, not described. Downhill incorporates elements of carving, freestyle, and freeride with the main focus on the thrill of speed. Look for technical features using everything from fiberglass, to w-concave, urethane bumpers, and a plethora of materials. Get your full face helmet and pucks out, and head to the hills.
Freeride - Much of skateboarding has been created by people who push the envelope on what is thought to be possible. Freeride is a direct result of this. Slide pucks and buttery wheels are your best friends once you have freeride on your mind. Often featuring concave that create pockets for your feet and shorter wheelbases, freeride boards are meant to make power slides as natural as your choice to skate.
Top Mount - The classic skate mount. Trucks are mounted from the top to sit flush with the bottom of the board for that proven ride and feel (as opposed to drop-through mounts, which are mounted through the board to lower your center of gravity).
Rocker - The rocker profile can be seen from the side and is identified as a slight smile. Rocker decks are great for both downhill and freeride. You'll feel snug and secure on a rocker profile and this is especially useful for freeride beginners.
Directional - Directional boards might have concave towards the front, maybe the tail is tapered, it could be shaped to have a fatter nose than tail, and it probably feels awkward if you hop on backwards. However, when you want to pump a board, or you want to have something that sets you up for the fastest line, directional boards are great. Whether you are looking for a really responsive directional board for carving and cruising or a precision downhill deck, a directional board could be in your future.
Wheel Wells/Flares - For the boards that don't need full wheel cutouts, wheel wells are beveled out of the board to give the extra clearance needed to avoid wheelbite.
W-Concave - With the right concave underfoot you'll feel you can skate anything. Concavity can be seen if you look at a board straight down the nose to the tail and W-concave looks like the letter W, makes sense right? Breaking away into a slide becomes easier with this style because you have a little more support where your toes/heels will anchor.
Adjustable Wheel Base - Sometimes you want a highly maneuverable setup that can navigate around people and cars in the city and turn on a dime. Other times you want a longer wheelbase for stability at speed. A board with an adjustable wheel base will have multiple truck mounting positions so you can change your setup according to your environment.