Hi, I've created a proposal some weeks ago, Zend_Validate_Isbn
Thomas Weidner helped me a lot during pre-community_review step http://framework.zend.com/wiki/display/ZFPROP/Zend_Validate_Isbn+-+Renan+de+Lima it's a simple class to validate ISBN-10 and ISBN-13 that now it's ready for review regards, -- Renan de Lima Barbosa +55 61 8166-7755 renandelima.com
