Spinning Toys: 

Related Sites:

Yo-Yos:

Yo-Yos

Yo-yos

Yo-yo History

Toys & Physics Links

Gyroscopes

Simple Machines

Tops:

Tops

How Stuff Works

Boomerangs

How to Throw a Boomerang

History of Toys

Frisbees 

Folk Toys

See-&-Say 

Make Your Own Physics Toys

Visit the Toy Chest

Frisbee Flights