You've probably seen this, but here's a link to the BLM info with a pic:
http://www.blm.gov/ut/st/en/fo/monticello/recreation/permits/grand_gulch_and_cedar.html
A little more info:
http://www.mountainbuzz.com/forums/f43/hiking-out-grand-gulch-from-san-juan-river-60403.html
A friend did it as a...