FOR LAPTOP PRESENTATIONS
The easiest adapter for stereo projection via laptop is the DualHead2Go. Once connected, use FN+F5 keys to utilize laptop monitor (1) and spanned monitors (2) for projectors. Make sure monitors are spanned by setting monitor 2 at 2048x768. We should now have 3 XGA monitors, so we like to have our desktop image at 3XGA! (One for laptop, and two targets to align projectors).
In POWERPOINT "Slide Show/Set Up Show", check Presented by a Speaker (under Show Type), and under Multiple Monitors make sure diplay is on monitor 2 (our horizontal spanned dual monitor/projector)... check Show Presenter View. When you hit F5 should should run on projectors while application (and notes, if written) will be on laptop.