The advantage of Sony having switched to ePub is that ADE encryption has been cracked. So it's now easy to liberate ebooks bought through Sony. B&N's ePub encryption hasn't been cracked yet, but it's probably just a matter of time. Until then, everyone should buy ePub from Sony and unlock the files so they can be read on any device. =D
Does anyone know which encryption method Fictionwise uses for its ePub files?