Yep, that's an internal game that has not been released. It also is not known whether it ever will be released.
As for the messenger, it would be easy to do the actual networking aspect. The reason it works on the DS is they have a touch screen for quickly typing out messages. On the Zune you have a DPad and therefore it would be really slow to type it out. I'll try and rough up a prototype in the next week or two and see what everyone thinks.
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