1. The old google reader did, this one is new.
2. duh
3. Well they do, but notice how none of them use the "1" button? That's becuase 1 is used to hide/show the navigation menu and afaik they hadn't figured out how to block inputs from getting to the browser. Like I said, I was aware of the links about and the fact that there had been some (rather glitchy) progress in getting buttons to work. Google reader actually blocks the browser from getting the events though and thus you have access to the entire button-set. One needs buttons 1, 2 and + and - to do a proper nes game, for example.