Here's a website that I found useful. It has a lot of information on all the artificial sweetners.

http://www.caloriecontrol.org/lowcal.html

I had looked for information on whether or not the common sweetners release insulin or not and, for example, this is what they say about Sucralose (Splenda):

"Sucralose is beneficial for individuals with diabetes because research demonstrates that sucralose has no effect on carbohydrate metabolism, short- or long-term blood glucose control, or insulin secretion."

Dean