Hey, nice to see your review of this great film. I believe I wrote one myself on the old board, but well, it's been a while. I liked the film also very much. Went to watch it after some great reviews, and because I had once seen the last 20 minutes of Kechiche's previous film "La faute a Voltaire" (i believe this to be the title...) which were a joy to watch. 
Imo one of the best films of the year, and I don't have anything to add to arsaib's review. Yes, the main actress was great, could have even gotten a cesar for best actress imo.
I think this will appear in my Top Ten 2005, and is already a favorite.