hmmm...
i do 'pro audio' with my pb, and three firewire drives.
i eject the drives, and shut them off, (after, of course, letting them spin down), every night.
i rarely shut off the pb itself, except when i travel (or am away from the pb for a week).
no real need to powerdown the 'book every night (but u can if u want to)
personally, i like the pulsing light...