I've used the clamped straight edge approach, but with my jigsaw, this results in the blade being bent significantly towards the straight-edge - very unhelpful. I don't know if this is a defect somewhere in my saw (it happens with any blade I put on), or if other people find this. I normally end up just concentrating hard on the line and doing it freehand.
For straight and angle cuts using a Bosch jigsaw try this one:
http://www.youtube.com/watch?v=0XF6grrtU7k
Perfect for almost all flooring jobs
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