I am ridiculously addicted, and I wish I had more broadband so that I could watch the anime. Instead, I have to settle for the manga, which is still great. The most faithful manga version (apparently) is
Lelouch of the Rebellion, and it cuts the whole Knightmare Frame deal out, which is good imo.
Suzaku of the Counterattack is OK, but it's not so great in comparison. And
Nightmare of Nunnally is great because it's so different. It's AU, which basically means that it's really confusing because different...