Reading these history reviews is fascinating. The visual refinements are easy to see through the versions. In my experience, the differences between Froyo and Gingerbread are immense and a precursor to the next logical step in the form of Ice Cream Sandwich. In comparison to the iOS history review, Android has changed styles many times while iOS has not changed so much visually.
I hope manufactuers either delay their Ice Cream Sandwich rollouts or provide a firm release date for their JellyBean updates.