The feature graphic for my app is showing up for the Android Market listing when viewed from a PC, but not on devices. This was pointed out to me in the Friday Review (at about 18:45 in), where they also mention that adding a feature graphic would fix the issue of missing a banner.
The feature graphic was uploaded when I first submitted the application, and has been there ever since. I also have a promotional graphic uploaded for the submission.
The sizes match the requirements mentioned here and here, and I saved them in the same format as the screenshots for the listing, which do show up on the Market listing from a device.
Any help or insight is greatly appreciated–thanks!
Feature graphics aren’t intended to show up when you are browsing Android market with your phone.