I'm pretty new to the show... so I'm still all obsessed with it and giddy.
I was searching the vast system of tubes for Patton Oswalt material (I was deep in the throes of "discovering" Patton at the time) when I saw the EP he did to raise money for WFMU. I thought, "Weird... 75 bucks for an EP? Who the hell is this Tom guy?" The only other time I'd heard of FMU was from an in-studio live cut on the Peelander-Z album "P-Bone Steak", which earned major coolness points with me. I also found a link to "Rambocky" on Patton's myspace site. While I could tell that there was a whole lot of inside-joke going on there that I wasn't getting, being a Philly boy myself, I loved it. I said, "EAU MY GAWD! NEM GUYS IS HILARIOUS!"
From there, I started goople-ing PBR, which led to Wurster/Scharpling, which led to my downloading a few shows to listen to during some horribly long drives between Philly and Rochester, NY (5.5 hours each way). I was thrilled to discover that Wurster does PBR pretty frequently, and since then, I've downloaded all the S/W albums from Rhapsody and have been working my way through them as well as the archives. I can't believe these guys aren't a bigger phenomenon. I don't know if I'll ever learn to enjoy some of the callers (I'm talking to you, Julie from Cincinnati), but that's a small price to pay.
BTW - If you haven't yet heard "Hippy Justice", it's ALL KILLER, NO FILLER. Kid E-Bay is one of the most bizarre ideas for a comedy sketch I can imagine, yet somehow, it comes off feeling almost natural. To me, that's as good as it gets.