Do you have a collection of hair products that you have decided don't work on your hair?  Don't just throw them away!

Consider donating your unused product to a local shelter for the homeless or a women's shelter.  They are sure to appreciate the product. (They especially like the sample sizes and hotel size bottles).

Conditioner can be used on your legs as a shaving cream.

Shampoos and 2-in-1 shampoo/conditioners work well for hand washing your delicates.  (I even use a touch of conditioner in the final rinse of my wool socks to make them extra soft!)

Offer them to a friend or neighbor.  Teenage girls love to have new products to try out (and their parents appreciate not having to pay for all of it!)