For all those interested in Roman toilets (and yes, there do seem to be a lot of you!) there's a new publication just out: Roman Toilets: their archaeology and cultural history.
The book stems from a workshop held in Rome in 2007 and its index can be downloaded here. One case study concerns Herculaneum by HCP archaeologist Domenico Camardo.
Reviews of the book aimed at a more general reader are inevitably going to follow the style of this one: "Roman toilets were quite stinky, large international study reveals."