i'm amazed he doesn't use an engine. he is probably the only grandmaster in the world who doesn't!
Ivanchuk Master Class at Gibraltar

Yeah, Moyuba, I was amazed by that too. For those who didn't watch the video, Ivanchuk says he has a chess database but doesn't use an engine. If he wants something analyzed by an engine every once in a while, he will ask somebody else (his trainer, I think) to do it for him. The man really does not like engines.
There is a great video of a "master class" by Ivanchuk at the Gibraltar tournament: http://blip.tv/gibchess/round7-ivanchuk-6515809
The later part, in which his fellow GM and audience members ask him questions, is especially interesting.