as this was boing boing ed a few weeks back i thought i'd show how it is done...
Step 1: Select your artwork.
Step 2: Lay out artwork in template file.
You can see here the example of my kite file (dxf original) overlayed to fill fully the page and look a little like an engineer's drawing spec...
Step 3: Determine raster / vector style of work.
the kite is vector meaning the laser follows the path of each individual line and therefore much finer detail can be produced.
Step 4: Set laser speeds and feeds appropriately.
the nice result setting is 50%speed, 100%power for a bitmap image, 20%speed, 100% power for a vector image.