Micro is a real 80-ies revival, reminds me of the good old Game & Watch, real simple controls, small form factor and high "lookie here".
And considering that there are (last number I heard) over 700 different Gameboy games released so far, it is no wonder there is room to make yet another wrapping for the system.
And as for taking another step in the 'battle' with PSP: the wifi offerings - get it rolling with Mario Kart, at home with your own net or for free at some hotspots. How cool is that? Wonder if it will work on campuses having wifi for students? That would be great, local yet mobile and disconnected. No option for using Picochat with wifi - but could be coming up.
And the service is being used; 52 000 of the first week sales of 112 000 units in the US played online. Need to try it, just have to find a suitable hotspot.