WM6, when designed to knock off Blackberry devices, was a little better.  The &quot;Start&quot; button brought you to an application tray, and it had a 4-way rocker (and optional resistive, stylus-input touchscreen) for navigation.  MS took some obvious hints from RIM, but they did deliver a good product.<p>Of course, it released roughly seven months before the iPhone, which beat the pants off of it.  At least it could play NetHack...