Resistance bands are great but not sure why someone would think that circuit training isn't good or resistance bands or better. A good circuit training workout can burn tons of calories. It would depend on what you are doing on how effective it is. I've seen people do circuit training with a personal trainer and was amazed at their workout.
As for resistance band dvds, I wasn't aware of any but I did a search for resistance bands on collagevideo and it turned up 4 videos.
http://www.collagevideo.com/searchre...esistance+band