Anastasia's Brow Wiz is a brow pencil on one end and a Spooley brush on the other for gentle coloring and blending. You can find it at: http://www.sephora.com/browse/product.jhtml;jsessi
Anastasia is the "guru" of eyebrow products and I personally love her Brow Powder Duo. If you're interested in taking a look at it you can find it at: http://www.sephora.com/browse/product.jhtml;jsessi
I hope this helps you.
I'm obsessed with my eyebrows. Even when I was little I would fret about them being too sparse.
I have tried so many different products, high end and low end. Even though I have a good routine I like, I still try new products because I'm always looking to perfect them.
My favorite pencil is the Brow Definer. It's very easy to use and is very versatile, there are three ways to use it! It's worth the investment if you're obsessed with your brows like me.
The best way I have found to fill in or darken eyebrows is not with a pencil; it's with a powder. One I really like is from Bare Esentuals. They have an awesome brow powder...you can top it off with either a brow wax or gel.