Hint: Get All 3 Endings
By saving your game near the end of the quest, you can play the ending and view all three different endings of Jade Empire.
Hint: Chi-Less Transformation
I've only done this with horse demon form, but I assume it works for all transformations. No chi is used for the first couple seconds of transformation (probably to the point that the screen stops glowing), so you can get in several melee attacks before any chi is used. If used in conjunction with an immobilizing attack, you can switch back and forth freely. Immobilize, transform, attack, transform, immobilize, etc.
Hint: Cheap Recharge
After getting the Dragon Amulet, equip it with gems that raise your stats (scholar, monk, and warrior). When you run out of the assosiated power, unequip and re-equip the gem to recharge the associated power. After you run out of points, unequip the gem and immediately re-equip it to regain points. This trick works very well with gems that raise all your stats.