In a message dated 11/22/2005 9:07:19 A.M. Mountain Standard Time, lee@novomail.net writes: The OEBFF is a file format proposed by Garth Conboy and John Rivlin, now of eBook Technologies, which uses the Multipurpose Internet Mail Extensions (MIME) to physically (well, conceptually) bundle OEBPS files together into a single file. I believe that the OEBFF is the file format used natively by the eBook Technologies ETI-1 and ETI-2 reading devices. Thus, OEBPS and OEBFF are not competing standards, but are, in fact, complementary technologies: the OEBPS describes one way of defining how multiple files can be combined to create a single digital publication, and the OEBFF describes one way of encapsulating those component files into a single file for subsequent transfer or use. You have made me very happy. My eBookwise Reader reads OEBFF and so does my husband's, which is en route to us now. So apparently we are not going to have to rush out a year from now and replace them. Thanks for the info. Anne