I would think a high speed jig saw with a fine tooth blade would do a decent job, it works for fiberglass. Just remember to wear some gloves and a dust mask, its quite sharp and you don't want to be breathing the dust.
dremel tool with cutoff wheel....carbon cuts like butter!
Get yourself a good set of dremel bits and cutoff wheels and go to town... I have cut out many parts and chassis out of graphite/carbon fiber over the years with this method. I some times will print out the shape on paper from a cad drawing and stick it to the plate so I have a template or draw it on paper first.
Make sure you wear a dust maks. I didn't years back and am sure it will kill me before it is all said and done... :-)
Alan Bachman (AKA - Johnny Rocket Fuel)
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It cuts so easy that you can get it pretty close to straight and then just use a flat block with some 180 sandpaper to finish off a straight edge. If you sink the cutoff wheel all the way into the material up to the shaft, the wheel uses itself to track straight.
After you are done cutting which ever way you decide to go (I have done the cut off wheel rout before with good results) you can seal the edge with some CA glue to help protect the edges and your fingers
I was looking for CF suppliers online and stumbled across a company called Dragon Plate. Not only do they sell CF products but offer a CNC service at supposedly reasonable prices (I have not used their CNC service yet).
I've cut CF before and it sucks. You don't want to breathe the dust and it's really messy.