Mongrel2
I'm surprised that he's doing this... after so much vitriol about the Ruby (and Rails) community and being "ripped off" with Mongrel, I would have expected him to never touch it again. Granted, it's written in C, but I'd expect it to be heavily used with Rails.That said, its good that he is writing it. The more software  is written, the higher the likelihood that _something_ will be great, and when Zed Shaw's writing it, it's probably pretty good.