I went to the midnight Imax showing of Dark Knight last night, and everything I have to say is under this spoiler-shielding cut tag:

O.M.F.G.
This was an incredible movie! The Joker was perfect. If When Heath Ledger gets the Oscar for this role, anyone who says he only got it because he died will need to get their head examined. Ledger's Joker was damn near perfect.
The movie was also well balanced in its portrayal of so many main figures. hellbob & I both really liked it. Although I never did spot Stan Lee's cameo in this one... ;P