I do contract work at airports (mainly ORD) so I see LOTS of gadgets. I like to walk around the concourses and check out what people are using.
- I see TONS of iPads. Mostly 1st gen, although maybe 20% are iPad 2.
I've seen one Galaxy Tab and one Xoom so far. I see lots of Blackberry Playbooks. . . at the display kiosks

Haven't seen one in the wild so far.
- The 3rd generation Kindle is about equally as plentiful as the iPad. I haven't seen a 1st gen Kindle since the 3rd gen came out (hard to tell the 2nd and 3rd gen apart at a glance). I see a Nook now and again, but nowhere near as often as the Kindle.
- iPhone is definitely the most common smartphone among travelers by a long shot. I'd say about 50% are the iPhone 4, the rest are earlier versions (hard to tell them apart at a glance). Next most popular are the various Blackberries (I don't really follow the BB market). Next is definitely the Evo 4G, followed by the O.G. Droid, then by the Droid X & various Galaxy S. I still see a handful of Palm Pres & Touch Pro 2s, and I've seen a few WP7 devices so far (Focus and a few HD7s). Still haven't seen a single Nokia smartphone