One of my main thoughts on this is whether Mobile Zune would work better than Mobile Media Player.
The Zune player interface is already the correct size and proportion and the wireless options on the Zune would be an easy step onto WinMo.
Our devices could be the Zune 'Nano' compared with the big brother 30Gb and 80Gb Zunes.
As our MicroSDs are only just reaching 12Gb, there wouldnt be any inhouse competition for the Zune to worry about, only an increase in compatible family members.
It would also get more people using the PC Zune interface.