I came across a cool web sit the other day that shows many of the different game engine solutions for mobile platforms at http://mobilegameengines.com. The list itself is very comprehensive and includes information relating to the engines as well as reviews from actual engine users.
If you have a spare 5-10 mins please consider leaving a review for the IwGame Engine at http://mobilegameengines.com/iphone/engines/40-iwgame-engine
And possibly also a review for the Marmalade SDK at http://mobilegameengines.com/iphone/engines/11-marmalade
A BIG thank you to anyone that gets the time to leave a review