The illusion of having a tangible document on your computer is supposedly more powerful with the flip page function since it mimics the natural way of browsing through a physical document, yet at the same time allows the user to use the traditional electronic benefits like searching through a document, jumping to a certain page, links to external websites etc.
In July 2002 Sean O'Shell of PixelWit.com won an open source contest on ActionScript.org with his free open source PageFlip software.
Mid 2004, Iparigrafika added a brand new feature in their flip page application, allowing the users to tear away pages and they reintroduced transparent pages which originally had been featured in the Perfect Fools' application.
Today (2008) Iparigrafika's open source software is still available, but most publishers turn to companies like Pagegangster or client based software like eBookCreator to convert their documents into flip page applications, due to their easy 'pdf to flash converter' that makes the document Google search engine friendly.
When talking about flip page, it's necessary to mention FlippingBook team. FlippingBook premium page flip engine is known since 2004, and now (2008) it is one of the most popular commercial software in the market. Generally it is being used by Adobe Flash developers (thanks to FlippingBook flash component) and Joomla developers (thanks to FlippingBook Joomla Gallery Component).
Another fast emerging flipping software technology is Epaperflip produced by Aglaia Software which offers free unlimited hosting and converts print ready files to a dynamic page flipping digital publication to make it even more interactive and user-friendly.