hello!
hi, what kinda oriental campaign are you running?
if you wish to lay out a strong magic/ psionic system along Oriental lines, you could try looking at Japanese Esoteric Buddhism and mythology - this stuff is pretty cool.
http://www.onmarkproductions.com/html/buddhism.shtml
if you want some stuff on Chinese/ Indian magical beliefs of the elemental systems and breakdown of the world, here's another useful link.
http://www.friesian.com/elements.htm
here's also some stuff on Chinese mythology and history of the Warring States and Romance of 3 Kingdoms:
http://kongming.net/novel/
this is a listing of Chinese gods and their names, for some inspiration:
http://clausius.engr.utk.edu/planetc/books/creation/text/characters.html
For something more Southeast Asian and syncrestic (here, in my part of the world we've been a major melting pot of Buddhist, Taoist, Hindu, Islamic, and indigenous animist beliefs, so it may suit a more diverse DnD campaign model) you may want to look at the following Indonesian stuff.
http://www.info-indo.com/religion/index.htm
Finally, if you just want some Chinese empire kung-fu style action, you can take a look at the dragon-fist page.
http://dragonfist.dyndns.org/rules.htm
hope this helps! if you need anything more, just holler!
yours,
shao