All About EPUB, the iBookstore Standard
If you're considering an iPad for the e-reader functionality or just want more information about iBookstore and EPUB, Apple blog TUAW has you covered. EPUB is an open standard and can be read by other e-readers like the Nook and Sony's Reader.
It's a free and open standard format created by the International Digital Publishing Forum (IDPF), and it's designed for reflowable content that can be optimized to whatever device is being used to read a book file. The IDPF has championed EPUB as a single format that can be used by publishers and conversion houses, as well as for distribution and sale of electronic books.
