There's been some good stuff on therpgsite recently. This thread, for example - on alternative uses for Pendragon. Through it I discovered Genpei - A Roleplaying Game of Early Feudal Japan, which was written by one of the board's members and based on the Pendragon system.
If I were ever to run a game set in feudal Japan, I'm pretty sure this would be it.
Another alternative use for Pendragon which springs to mind is for running games set in the feudal universe of Dune.