Katherine Heigl
I wish more actors would do stuff like this.  Katherine Heigl refused to put herself up for an Emmy this year for her work on Grey’s Anatomy.  She gave her reasoning for such a selfless act in a written statement:

I did not feel that I was given the material this season to warrant an Emmy nomination and in an effort to maintain the integrity of the academy organization…  In addition, I did not want to potentially take away an opportunity from an actress who was given such materials,” added Heigl. 

Humility is hot, no?