I'm most impressed with Natal, then WM+ and finally Purple Wand.
But in terms of real world application (and how/if it'll change gaming) I'd go with the rankings OP gave.
WM+ clearly showed it can be done, so it gets top spot. Sony's tech demo wasn't impressive, but the foundation was there (FPS, RTS, Action games could all be done.) My only issue is, by the time this rolls out, will any games be good enough to compete on the level of Nintendo (I'm sure developers would have gotten a handle on WM+ by then). Natal I'm not so sure about, sure it'll be great in terms of moving technology forward, but I don't see it being as capable to adapt to as many games as Nintendo's or Sonys. Also I'm not sure it'll be able to replace a physical object (controller) yet.
Anyway, OP, can you link to the IGN article that say Milo doesn't work? All I've found is the one that say Natal does.







