I just looked up the address for the tutorial that was so good. Here it is. http://www.youtube.com/watch?v=Dy0JG-TEWf8&feature=related It was made by Linda Germaine. It shows some great possibilities on how it can be used to make beautiful designs.
I'm not sure of the advantages but if you want to see more how the gelatin is used, there are several tutorials on U-Tube that illustrate how it works and how to get good designs from it. I think you can just go to U-Tube and search for gelatin monoprinting.