Kirk,
If I knew I was scheduling images for later FTP/PhotoShelter I, hopefully, wouldn't forget and shut down. PM could have a message popup informing that a FTP/PhotoShelter schedule has been set. I, for the most part, keep my computer on all the time for e-mail, rss feeds etc.
As for sleeping, is this something that can be done in the background?
I use SuperDuper as a backup program on my iBook and it is set to backup in the middle of the night and will wake the computer to perform the task. Is this something that PM could do?
~Rob