Here they are: http://www.nahbrc.org/toolbase/pandt/tech/abstracts/roofsab5.html
also here: http://www.reesewholesale.com/catalog/131.pdf
They carry them at my local lumber yard. I only used them in my addition b/c they were used originally in the rest of the house. They seem to be the fastest way to do soffit venting, even in a house with overhangs. No problems with leaks etc. with or without gutters. Billy's reply seems a bit extreme, lots of carpentry etc. involved. With these drip edges you just pull off your old drip edge, rip a little off the top of your fascia (if there isn't a gap already), install new drip edge, and make sure to use vent keepers (plastic or styrofoam standoffs to keep the insulation away from the plywood) all the way from soffit to ridge. Done! It is possible you might be able to do this without wrecking the shingles, if yo use the right nail removal tool and judicious roofing tar.