Wow!! The colors …and the trees … and the floating …spinning …light …waterfall …flying …!! (Not a very useful review, oh well.)
It was so much like the world we used to imagine and play about, that I would wish with all my might to jump into. I would think: I’m going to open my eyes in five seconds and I’ll be there, if I take one step on the surface that’s it. The next breath I breathe will be the atmosphere of Kappa. That was my designation for our planet. The rest is secret; I wouldn’t want to screw up my travel options, just in case wishes become real.

(nabbed off this guy’s blog) These Pandoran life forms were inspired by Christmas tree worms, Spirobranchus giganteus:

(source)
So, how much does Avatar borrow from Maori history?