I think if the domain's down, you should at least make the three episodes available for download on the F+ sidebar. Nothing fancy, but just a note that says something like "Irregular: This was a short-lived project dedicated to interviewing quirky, obscure, or otherwise unusual internet dwellers. It was not directly related to this podcast, but offered a different perspective on some of the subjects that were read about on the F+. If you are interested in an interview, please contact Lemon and offer him lots of sexual favors. As in party favors. He especially likes the ones that make the really high-pitched, funny noise." And then just link to the three episodes.
Those three episodes were insightful enough that I think they should still be made available, if not on their own dedicated website. Just my two cents anyway.