'Arms and Armors' by Bastion Press. While some of the weapons are hokey (razor disk launcher

??), there is a multitude of weapons with a distinctly asian/kung fu feel. Good examples in the book are the Jung, Meteor Hammer, Mother & Son Hammer, Horse Halberd (actually a kind of tonfa), Dragon Head Stick (more of a spiked chain), etc. Then again, compared to kung fu movies, the razor disk launcher may not be so hokey!!
Of all things, I'd start looking to the recent M:tG sets for flavor. There are the typical samurai and ninja, but the focus is on the spirits and the thinning barrier between their world and ours. The new abilities may give some ideas for creating asian spirits. you can use this link to look and read w/o having to pay for the cards.
http://www.ccgzone.com/products.asp?product=M
Champions Of Konigawa' and 'Betrayers of Konigawa' sets are lists. 'Saviors of Konigawa' should be up sometime soon.
If you want to go
WAY out into left field, check out 'Mystic China' by Paladium (the guys who make RIFTS). The hp structure is the same (one HD per level, and its SDC: no mega monsters

) and it does operate on a level system, so it may not be too hard to transfer over. The flavor text might take you in new directions (a demon wrestler who knows that a demon is ticklish?). My personal favorite is the Redeeming Demon (don't remember that actual name). You actually lose powers as you level, attempting to become human!!!
