I started wearing bronzer all over my face a few years ago when I got vigilant about wearing sunscreen on my face. My bronzer of choice for this is Bare Minerals Warmth or Faux Tan (as I've mentioned here and here.) I love that they are mineral and don't clog pores, and I can use a tiny bit to give color on my forehead, nose, cheeks and blend into my jaw and neck.
YES, ladies...the neck is generally the lightest part of your upper body!! I learned this trick when I saw myself in pictures with my lightly faux bronzed face and stark white neck. It was shocking. It has since become a pet peeve of mine, and I notice it in my celebrities' photos as well.
If you are a faux bronzer, bronze your neck!