[x10guy]

I don't see the Palm Pre as a serious contender simply because they are bit late and they are currenly only on Sprint which is still bleeding customers. (I can't remember the time when Sprint was actually gaining customers). Palm is also too small.

I say Android simple because of 3 reasons.
1. Across all carriers
2. Google is behind it
3. Open source
It is arriving a bit late but I think by next year, it'll be past WinMo and beyond.

I say the iPhone simple because it is already there, despite being only on ATT. I probably would also add BB (blackberry) to the mix too.

Winmo won't go away simple because Microsoft is behind it. But it has already lost the lead and baring any breakthrough miracle, probably will never get it back.