Best movie: Prosnorkulus
Best game: Abobo
Lucky Day Forever was awesome, but you can't deny that the main idea has been done over and over again. Is it unfair that I expect originality more from a deep and beautiful movie like Lucky Day Forever, but less so from a violent funny movie like Prosnorkulus (which was awesome as well)? Maybe...
User of the Year:
RicePirate (assuming he didn't win 2011)
Shocking that his name hasn't been mentioned yet. Few users (excluding those who won that award already) contributed nearly as much to NG as he did.
Same reason as above, but without the 'hasn't been mentioned yet' part.
Can't really pick a musician, since I don't know enough musicians, but I agree that Kor-Rune does great stuff.
There is no spot for an artist of the year, but if there was one, I'd nominate Fartur-Ast. His frontpaged art and the wall art he created for the winter theme are only gems in the treasure he posted on NG throughout the year.