Adobe Illustrator CS4.
I often get asked how I use the gradient tool. Usually the answer is "I don't." This piece has one set of gradients (as in the gradient tool was used...you could argue that the whole piece has varieties of gradients...). It actually seems to be the perfect thing for blush. Which was a nice discovery.
I really like this piece... wish I could think of a better title XD
Close ups of different parts: [link]