Sean McGrath is unhappy over how long it takes to boot a PC (laptop, in this example). That's why I rarely shut mine down anymore - I just close the shell and let it hibernate. I've left my machine in that state for over a day as I've traveled, and even when the battery dies, things are ok - the system gets snapshotted to disk.

Maybe I'm just comfortable with the idea of snapshots, since that's what a Smalltalk image does when you save it :)