fair enough. (IMG:http://www.hirescovers.net/forum/style_emoticons/default/8834.gif
I realise it [ Acrobat ] isn't as widely used outside the printing industry and that some members may not know how to create a decent .pdf file, but Acrobat Reader is a free download and most browsers [ with the help of a plugin ] can display .pdf files, therefore I would imagine the printing aspect wouldn't be an issue. There might be some education required for cover generators, however.
As Skallywag alluded to, immediate benefits over the JPEG file format could be;
artwork for both the outside and inside of cases could be offered in one file, or layered files for multiple languages [ or the ability to 'switch off' the synopsis on the back, leaving the base artwork and logos etc for others to customise or translate ], CYMK colour space and vector based font information [ possibly leading to smaller files? ].
Should this be of any interest to anyone, I would be happy to write up some documentation for a FAQ/Wiki section?