Thanks to Christopher Breen for recommending Power Manager in Macworld's Mac 911 column.
Christopher recommended Power Manager 3 to Brian Silverman as a more capable replacement to Mac OS X's built-in Energy Saver scheduler.
"Unlike with Energy Saver, Power Manager 3 allows you to create schedules for any day and time of the week. Additionally it can handle a variety of tasks including startup, wake, sleep, log out, log in, restart, and shut down. You can also create one-time events."
Christopher Breen, Macworld