Has anyone out there in answers.yahoo land hooked up a laptiop to a bank of solar cells to power the laptop?

If you have used solar cells to charge your laptop batteries or other batteries what did you use as the solar cell array?

Did you need any sort of diodes, resistors, capacitors or other things that I haven't thought of to regulate to power flow into the device and or prevent a over charge spike or reverse a drain on the device.

I have run accross another solution a solar powered backpack to keep your lap charged. http://www.voltaicsystems.com/