I just posted a long youtube video "Living FPV 2" that I downloaded and converted to "gmplay" format. For those who missed it, gmplay can play fullscreen videos on all eink kindle models, but the DX and DXG drop frames because they can only do 1.3 FPS (but the sequence of still images is sharper than continuous video).
More videos have been posted now too, including great old vintage silent films.
The K3 and newer eink kindles can play full screen video at full speed. There are two videos you can download (one computer generated -- the other filmed by on onboard camera mounted in a remote-controlled airplane). "Action shots" like the FPV video show that video on eink is much better and more useful than I thought it would be. Source code is provided for video the player.
You can download gmplay and videos for it here: