Yep, pre-keyed explosions of flame and black smoke. Using them is drag-and-drop easy -- as long as your compositing program will work with PNG-compression Quicktime footage that has a built-in alpha layer. So far, we hear it works with Premiere, AE, Shake, Vegas, Avid and Final Cut; but not Pinnacle.
Best way to test? Download the free one to the left there and try it out!