Clipless question...

[KnottedYet]

Be careful with your terminology when you go to buy pedals.

BMX are a specific kind of platform pedal. (used by Bicycle Moto-Cross style riders) http://en.wikipedia.org/wiki/Bmx

What you have been looking at are regular "bear trap" style platform pedals. Usually made of metal, sometimes made of plastic (like the platform part of the shimano you linked)

If you are thinking of a pedal that is essentially a flat solid piece of metal with pins covering its surface like a cyborg porcupine, that's BMX.

If you are thinking of a pedal with ridges and teeth cut into it, that's a standard "bear trap" pedal.

Be sure to use the right name when you go shopping at the LBS, or you could end up with something you don't want!

ETA: this wikipedia article is good, with a pic of a beartrap platform right over a pic of a somewhat streamlined non-adjustable pin BMX style pedal. http://en.wikipedia.org/wiki/Bicycle_pedal

Here's a critter with pins: http://www.speedplay.com/index.cfm?f...=home.drillium
and here's one with teeth: http://www.rei.com/product/752205

There are a bazillion varieties along the sundry themes of "pedal", combinations abound.