(here via network)

It depends on the fandom. Supernatural has a community (http://spn-gen-podfics.livejournal.com/) for gen podfic.

The audiofic archive lists gen with a separate tag, so:
http://www.audiofic.jinjurly.com/category/sherlock-bbcgen
http://www.audiofic.jinjurly.com/category/fandomcriminal-minds/criminal-mindsgen
http://www.audiofic.jinjurly.com/category/fandomsupernatural/supernaturalgen
and so on.

Here is one Mag7 story (http://amplificathon.livejournal.com/1460117.html) not sure if it's the one that you found; some Bandom/Stargate (http://amplificathon.livejournal.com/1417732.html); Firefly (http://amplificathon.livejournal.com/1391806.html); a mixed bag, Harry Potter, Bandom, Buffy, the Lilo&Stitch/Hawaii 5-0 one is delightful (http://amplificathon.livejournal.com/1421857.html), Discworld (http://reena-jenkins.livejournal.com/), Dr Who (http://amplificathon.livejournal.com/1254813.html)... I'm reccing a lot by one of my favorite readers, reena jenkins, who created a monumental and fanciful, astounding podifc compendium called The Intangible Residuum: A Collection Of Stories (http://amplificathon.livejournal.com/1078262.html), many of which are gen and which are all quirky and fascinating.