The internets have been inoperative here for most of the past 24 hours. Yikes!
We saw AVATAR yesterday. This was my first experience with "Real D" and I was so happy it didn't bother me or give me a bad headache like the older red/blue glasses always did. I did have just a very slight headache afterward, but nothing horrible. (Betsy had a really bad one, on the other hand, but she's not sure it was due to the glasses).
I also thought the film could have been trimmed by at least 15 minutes, and I guessed the ending probably an hour before we got to it, but otherwise I thought it was quite a spectacular achievement. The one thing that made me laugh repeatedly was how James Horner ripped off the first two notes/harmonies of the second 8 of "My Heart Will Go On", ultimately resolving it so that phrase was v, IV, I (rather than i, bVII, bVI). Betsy and I both commented afterward it was a lot like "Dances With Wolves," which evidently echoes what Ebert said.