I do want to note one thing, though. I remember lots of reviews either lightly making fun of James Cameron, or ripping him outright, for his naming the elusive mineral the mining company in the movie is looking for unobtainium. Well, a few weeks ago I was reading David Brin's Startide Rising (which I ended up bouncing off and stopping in the middle, despite the book's somewhat classic status), and I found this passage on page 93:
None of the other moons in the Kthsemenee had the one attribute this one possessed: a core of almost one percent unobtainium. [Emphasis added]
Well, lookee there. Cameron just used a term that David Brin used in a highly-regarded novel years before. What a yutz!