Stopped back by the Microsoft booth at CES after our recent encounter with Windows Mobile 6.5.3 on the Toshiba TG01, and, sure enough, there's more lurking around. The Pharos Traveler 137's got it (Build 28005.5.3.0). And right next door was the Sony Ericsson Xperia X2, and it had 6.5.3 as well, though it's so heavily skinned with the Panels interface that you can't tell at first glance.

Two more phones with possible upgrades on the way.