I was just watching The Simpsons and after that, That 70's Show came on. Eric(a character on That 70's Show) was sitting on the couch playing with what is pictured above. I typed in magnet wheel toy in the google images search engine and the picture above came up.

What is the official name for these things? I want to order one, I used to have one when I was a kid.

The original by Whammo was called Wheel-o

That my friend, is a "Whee-lo".
You can buy one from this link:
http://www.physlink.com/estore/cart/MagneticGyroFlyWheel.cfm?SID=37
Never done business with this place, so I can't vouch for 'em.

The one we had was whiz-wheel