Spirits of Independents was one of the few (perhaps the first?) indie comics con held in Columbus before the founding of SPACE (Small Press and Alternative Comics Expo). I remember Dave Sim, who helped coordinate the show with Bob Corby, graciously treated many of the cartoonists involved to a Damon's Ribs dinner afterwards.
For a better look at the Dave Sim and Dan Zelig letters, click here: http://www.nenoworld.com/Spirits_of_Independents.html
Diamond, of course, no longer distributes comics from Columbus.
I very much miss Joe Zabel's contributions to the cartooning arts. His self-published comic books of the '90s were some of my favorites. He's a great guy and a major talent.
The info on my old business card above is long out of date, natch.
Max Ink is still quite busy cartooning, primarily with his Columbus-based series Blink: http://blinkcomic.wordpress.com/about/
Tyim Courts is still active as a designer: http://www.tyimcourts.com/