Dave Sim's Collected Letters 2004
So the book has been released, and is available here, or at your local comic shop. I wrote about my correspondence with Dave Sim here. Letters that other people wrote to Dave (which he responded to in Collected Letters 2004) are on the web here. Cerebus trade paperbacks are available here.
It appears he has put my name on the back cover.
From the Index:
Cowboy Actor, 182
Earles, Ray, 92, 139, 154, 165, 170, 175, 183, 224, 281, 298, 304, 383, 401, 453, 505
FUCK(tm), 291