The book features of the new Apple iPad really hold the potential of mainstreaming the EPUB ebook document format. At least with Adobe InDesign CS4 creating EPUBs is not as easy as exporting to PDF. Here are some guidelines for producing them using ID CS4 from Adobe.
Adobe InDesign CS5 is scheduled to be released on April 12. I really will be looking to see how this format is supported in this new version.