cd. I have a non-official copy. Basically, its the service manual, with added features like typical problems in a z32 and mods. Its a pretty neat cd and for $5, I couldn't go wrong. Now that I have a laptop, I can go out to my car with the cd and not have to worry about connecting to the internet. The only problem now is not getting the keys dirty, I always forget to take gloves off. My cd is copyable. I bought it off of ebay and it was delivered from Austrailia. Took a while because it was held up in customs for some reason.
Funny thing is my girlfriend says I'm too fast. Go figure ~jonnyz (DC)