I recently heard a great (and unique) tip for getting motivated to lose that extra weight: Give your kids a digital camera.
Kids love taking their own pictures, especially candids and especially of mom and dad. Even better than that? They also love sharing them with everyone you know (even people you don't know). They just keep on snapping shots until the camera runs out of memory. Kids don't give you a warning, they don't ask you to say cheese, they don't give you time to cock your head into your "I don't want to have double chin" pose, they just snap the picture. So if having hundreds of pictures of yourself taken from three feet high does not help to motivate you to start exercising, I don't know what will.
It's just an idea, but hey, it could work for you. Share your own ideas in the comments section below.