A forum member on PPCGeeks patched up a version of Windows Mobile 6—complete with HTC's fancy home screen on the HTC Touch—for the aging Sprint and Verizon 6700 phones. It's not compatible with the 6800 (the Sprint Mogul, which already has WM6), so don't install it there. But if you want to get some extra life out of…
The Sprint Mogul stacks up quite well compared with its predecessors and its distant cousin the 700wx.
Looks like the 6700, close cousin of the 6500, will be running Windows Mobile 5 and be so cool you won't even be able to stand it. More as we get it.