It's nice, because it holds up to 4 gb of files, I can organize them however I want in the heirarchy of folders, and i can save bookmarks on the file, so I can pick up the story wherever I left off

IPhone is equally nice, if I have Internet access. I do have an ebook application (stanza) but I don't use it as much as my DS because of the platform you need for your computer to transfer files