I am sure most of you guys are familiar with Jeff Mucha's shutdown controller. If you're not check out my sig under hardware-> shutdown controller.
I have a slightly modified version of it where when it first turns on, sends out a pulse "ground" signal to the laptop switch button. Afterwords it operates the same way.
I will post a schematic up here later tonight. The only bad thing about this is that you have to open up your laptop and wire 1 wire to your switch. I have a docking station so makes it must easier to wire it.