Good question Paul, I wonder about that too.
It has been a long time since I was laying out dwelling unit circuits and there were no AFCIs to worry about.
That said mostly I laid out by convenience of wiring runs, not circuits by room.
Also standard practice in my area is not to have one circuit per room, this is not a code requirement just how the EEs draw the prints.
At the time I worked for a cheap contractor and the rules where less strict.
We would run from the panel to the closest bathroom outlet, put a GFCI there then hit any other bathrooms then continue onto the outside outlets.
I always hated doing it that way and wondered what the home owners thought when they figured this out.
Bob
[This message has been edited by iwire (edited 04-28-2004).]