Setting up apache proxy + mongrels, while not impossible, is also not brain-dead easy. Also, in virtual private server scenarios RAM may be a hot commodity (sl

Setting up apache proxy + mongrels, while not impossible, is also not brain-dead easy. Also, in virtual private server scenarios RAM may be a hot commodity (slicehost, for instance) -- so in theory this should help you run more rails sites with less RAM, since you won't have to spin up individual mongrel clusters for each domain.