Here is a new demo of a Nook Simple Touch running PlayStation 1 games using the "NoRefresh" hack. The eink animation is quite usable. We should be able to do this on our kindles too!
I am looking forward to progress on this stuff once we get a good SDL library going on the kindles. The NST is farther ahead of kindle development because it has android built-in (with a much larger android developer base), while on the kindles we have a LOT less native support, so we have to do a lot more to achieve these results.