Thanks for asking! I also really don't want this to fizzle away.

It is still being pursued by myself, Michael Vassar, and Michael GR via back channels rather than what I outlined in that post and it is indeed getting serious attention, but I don't expect us to have meaningful results for at least a year. I will make a Less Wrong post as soon as there is anything the public at large can do -- in the meanwhile, I respectfully ask that you or others do not start your own Craigslist charity group, as it may hurt our efforts at moving forward with this.

ETA: Successfully pulling off this Craigslist thing has big overlaps with solving optimal philanthropy in general.