I've been having some problems with my 12" 800 iBook recently. I just sent it in to Apple last week to fix something that was obviously a logic board problem, and they replaced that under warranty, and a bunch of stuff relating to the display, too.
A few days after getting it back, I noticed some of the backlight problems that others have reported: when the hinge is in a certain position, the backlight goes out. Moving the hinge out of that position turns the backlight on again. It struck me as odd, since I never had this particular problem before.
Is this the type of thing that an authorized repair center or Apple Store could fix? I don't want to have to send it back to Apple again if I can help it (especially since a tech there obviously didn't do the job right when I sent it in last time), but would they be able to fix it on the spot, or would they have to send it out to Apple anyway?