[Weapondrift]

well a couple of things come to mind since this is Zuneware (yes I made that up...hmmm I should market this lol) Having owned the previous two Zunes the marketplace leaves much to be desired. For one, you buy things using "points" yes thats right all you XBOXers that are already be familier with Microsoft Points may or may not be happy to know this is the same concept.
Keep in mind im only specuating on my experiences with the 1st and 2nd gen Zune. Secondly, the interface was so touchy I had to turn the touchpad off (2nd gen) because there was no way to edit the speed of the cursor to my preference...which for some reason was always set to "crackhead speed" high. Im not by any means saying this is a horrible idea Im just giving all you developers some idea of what to expect given my experiences. Finally and this is what im really TRULY sceptical of, the battery life on the Zune was downright HORRIBLE. I would have a complete charge when i left my house at 9pm turn the zune off come back that moring after work at 630a amd the battery would be dead. Keep in mind that there were no running apps on my device and even if there were, powering the system down would eliminate those running apps from continuing

Also as far as Developing/Hacking is conserned, the Zune required some knowledge of C# to modify/edit certain things. (I.E. design your own games) Hopefully this may still be the case with the phone.