I'm having an interesting problem with my new 17" AlBook. The light sensor has intermittently been ceasing to work. After experimenting a bit, I've tracked it down to happening only when I put the book to sleep by closing the lid -- when it wakes back up, the ALS is non-functional. I can then sleep it via the apple menu, and the ALS works when it wakes back up, but closing the lid turns it back off again. Has anyone else experienced this?