i attended an NEC 2002 training course earlier this year, and the instructor told us that:
1. Historically, more fires started in bedrooms.
2. That extension cords were used more, by far, in bedrooms. ($1.99 cheapo #16 or #18 types)
3. That bedding combustibility was a big concern. (someone rolls over, or throws off a blanket or comforter)
Sandro - i agree with you, why just the bedrooms? i predict that all breakers will have AFCI protection in the future. could save a lot of lives - especially in older buildings if retrofitted.