I've been watching a lot of 2D hand drawn/flash stuff recently, that has some impressive looking lighting on it. With a lot of it, I can imagine it's Photoshop, and painting techniques.
But a lot of it, looks like there is lighting generated.
Does anybody know of any tutorials/guides that could help me simulate nice lighting effects for 2D animation?
Here are some examples to give a better idea of what I'm talking about: