Great thread, P.O.B!
I found the show through the internets, like this:
Mr.Show ---> bobanddavid.com ---> pattonoswalt.com ---> aspecialthing.com ---> AST chat --->
I met Tom in that chat - he was using his real name so I assumed he was a big shot, like Jack Szwergold. He was!
If I recall, I was depressed and drunk and posted angrily about Sarah Silverman, so I'm sure I gave a bad first impression. I assume he doesn't remember any of that, though it was around that time he abandoned the AST chat. I blame Jack Szwergold.
The bit that got me addicted wasn't a Wurster call - it was Tom contemplating the death of CBGB. Over the course of that half-hour rant, I came to realize that Tom was the greatest radio personality of all time. I ordered all of the discs, started plowing through the archives, and am now a near-completist.
I'd never heard of WFMU before the Best Show, though now I'm obviously indebted to them. (Literally - I haven't paid my marathon pledge yet but I will. I swear. I have to make like Zach G. and wait 'til I get my money right.)