Thanks for responding me
What you people have told me, it's quite enlighting. I never saw the iPad as a consumer product... But as a full computer. Thanks.
By the way, yes, I'm having trouble with the filesystem:
I have two ebook readers, Stanza and iBook. I want to share my ebooks, but I don't know how to set a common folder, in orden to not duplicate my files. Is it possible to achieve it?