Firthness stories (recommendations) can be found on the recommendations page.  Darcyfic stories (those submitted to the darcyfic mailing list) can be found in the Darcyfic archives.  And, finally, those stories written by firthness authors (authors whose fanfiction sites are hosted by firthness) can be found through the fanfiction page.

Easy as pie ;)

Oh, yeah...I'll go enlighten myself more in the faqs...