Mac users interested in Epub zip by mobileread generally download:
Extracting the files from an ePub is easy - you can just unzip the file and then you get a folder full of the contents of the ePub.
But zipping the folder of files back up into an ePub isn't as easy - it needs to be zipped in a specific way.
Just drag the folder of files onto the Applescript application, and your epub will be created.
