This respurce is all about the safety standards that Snell puts on their helmets. Since helmets are extremely important to wear while rollerblading, you can look at what the standards are for rollerblading helmets.

You can cruise and carve while you investigate which skateboard wheels produce the fastest (and slowest) rides on your terrain in these experiments. You pick the wheels and design the tests you think will produce the most extreme results...

This site provides information on the history of the sport of skateboarding.