Here is a good review I found:
http://www.criticalorie.com/2008/form-review/
It is interesting in even a website that promotes diet pills, calls Form diet pills 'sketchy at best'.
Actually here is one that goes over the ingredients:
http://www.dietpillcritic.com/diet-pills/form/
Here are a few excerpts from that review:
"FORM contains nothing other than a polyacrylic acid hydrogel with the brandname of SWELL. This polyacrylic acid hydrogel is supposed to absorb up to 1000 times its weight in water. Polyacrylic acid hydrogel is not something you would normally intentionally put in your body. Telling people to eat it is almost like telling them to eat a t-shirt, a plastic bag, or something your body is not going to be able to break down into food, but that would theoretically make you feel full."
"Polyacrylic acid hydrogel is the only active ingredient in FORM, and it does not have any properties that will help you lose weight. The only thing it does is swell up in your stomach so there is less room when it comes time to eat, theoretically making it more difficult to overeat.
Similar hydrogels are used in breast implants, baby diapers to absorb urine, and various other applications, but as far as I can find this is the first time anyone has ever marketed it as a “diet pill” that you would actually ingest. While the hydrogel used in this so-called “diet pill” is surely non-toxic, I would still be very hesitant to put something so untested and synthetic like this into my body, when good old natural fiber would do the exact same trick."