Honeycomb and Ice Cream Sandwich Android-running hardware has had access to HD resolution YouTube streams since launch, but an update to the app that rolled out yesterday finally brings HD to some devices running Froyo or Gingerbread. The catch is that YouTube HD res won't work on every Android 2.2 or 2.3 phone or tablet, as we're told it is set dynamically based on screen size and resolution. Another catch is that some devices still won't install the updated version directly from the Market, like the Epic 4G Touch.
Still, through official or unofficial means, if you have the right screen, you will now be able to view videos in higher pixels. Mind you though, be careful of your data cap if you are on anyone but Sprint, excluding the grandfathered unlimited data plans.