From: Jason Halprin (email suppressed)
Date: Wed Nov 19 2008 - 06:45:16 PST
Someone who I've used in the past, and as far as I know is still doing negative cutting, is Jim Prange in Colorado Springs. You can reach him at http://imagequeststudios.com/ (call the phone number), or (address suppressed)
For info on FrameWorks, contact Pip Chodorov at <email suppressed>.