I will admit that this us a windup, but there is one aspect of the iPad WiFi that particularly irks me, the lack of GPS receiver.
It really can't be explained away in terms of battery life, deciding what features to leave out in the name of good tablet design etc.
I can think of only two possible reasons:-
1. A lack of imagination in thinking that GPS was only required to support Google Maps and the like. No thought given to GPS apps that have on board maps, such as in-car navigation or "raster mapping" apps.
2. Over-eagerness to send revenue the way of the mobile carrier that Apple originally aligned with for the iPad 3G.