Human Software has released Photo-Light 2.0, a Photoshop plug-in that allows you to cast light and shadows in your Photoshop images. The software offers a number of other lighting effects, as well. The new version sports new features, new premade effects, and more.
The software uses a combination of channels, mattes, and paths to create its effects, and the company says that it "handles displacement of light according to the background" in your image.
You can find more information on the software at Human Softwareis Web site. Photo-Light is priced at US$69.95, and the company is offering owners of version 1.x an upgrade for $29.