I have a few, that I can't pull out of my hat right now. But, the best one I have is coconut oil. It's the bomb for moisterizer - lips, skin, hair, etc. and internally as well - so good for you. I also use it to make homemade toothpaste on ocassion.
Oh, another one to help prevent razor burn in the bikini area is to put a bit of antibacterial cream or gel (like neosporin) on after you shave. (I've since had my bikini area lasered which is the bomb!)
Use coffee grinds as an exfoliant on your legs. You'll be sloughing off dead skin and reducing the look of cellulite because of the caffeine.
To make your own sugar scrub - buy superfine baker's sugar, mix with a little brown sugar and almond oil (or olive oil) and add in some essential oils.
I've read that sleeping with satin or silk pillowcases is better for your hair (less breakage than with a cotton pillow). Also, don't wear your hair up because it can cause more breakage.
I recently read (in Oprah I believe) about beauty myths that most of us believe and one that stuck out was to not use a boar's bristle brush, but a paddle brush because boar's bristle causes more breakage. I never knew that one.
I don't use a brush or comb at all after washing my hair, just my fingers. Only use conditioner on the ends of your hair. If you have really frizzy hair, use a little bit of leave-in conditioner after it's been dried to help it to lay down in place of gel or cream.
I second the tip about adding regular lotion to your tanning lotion - makes it much more natural looking. Remember to put lots of regular lotion on your hands before putting it on your body to reduce that orange hand/fingernail effect.
I guess I remembered more as I was typing;)