I love plastic storage containers and baskets. Here is a little peek into my TV / Play room closet that holds my children's games, extra school supplies, movies, etc...
When building our house and working on closets we went with the Closet Maid shelves that are adjustable. They are great because it's nice to be able to change the height of your shelving when the need arises.
Plastic containers in this closet hold Lego's, card games, video games, controllers and accessories. I also use the Dollar Store plastic baskets to hold a variety of items. In this picture one is the home of extra school paper (loose leaf and notebook) as well as pencils for my boys. They know right where they are and can get it themselves as they need them - yea right, like that actually happens (that's a post for another day, LOL).
What are some of your favorite ways to organize your closets?