I agree there is in fact a golden opportunity to change the face of PPing by using guiguts to encourage better practices by changing default behavior and flagging bad practices. Most PPers will download the next release when announced given the bugginess of earlier versions. All we need is some volunteers to help with development (just send me your sourceforge ID). For instance if someone wants to add HTML markup to identify a cover image I can point you to the right spot in the code. If I understand, it is up to the WWers to decide whether to accept vanity epubs. Perhaps they would be more willing if someone gave them a tool to check epubs, i.e. explode them and check for a cover, valid HTML, etc. I would be happy to include ZML scripts and test cases with guiguts if they are shared with me. Perhaps a system for crowdsourcing corrections could also be used for distributed PPing. I am working towards encapsulating guiguts functionality into libraries that could be used in a web based approach. Hunter