The third device is the Sprint HTC Touch with it having TouchFLO, both Sprint TV/Sprint Music Store access, Windows Mobile 6, 2.0 megapixel camera, and a future upgrade to EVDO Rev. A.
The only notable thing is it looks like Sprint has developed an additional Today Screen plugin for their custom apps, SprintTV among them. The other icons are relatively mysterious - anybody have any thoughts on what they might be?
A 3G Touch could really compete with the iPhone, even if you do get dropped out of the fancy TouchFLO interface into standard Windows Mobile all the time. See Part 1 and Part 2 (with video goodness) of my HTC Touch vs iPhone articles.
There's a new version of TouchFLO out on the Nike with better integration into the various WM apps, a video is after the break. No word yet if the Sprint Touch will rock it or not.
Hat tip to surur in the TreoCentral forum for the Centro.