Jeppesen have some useful material on this subject. Also back in June the FAA put out an AC on this (Electronic Flight Bag) EFB, this outlines the three classes of EFB and what you can and can't do with your EFB. This AC is under constant review due to the fact EFB is a relitivly new thing. The airlines are pushing the various authorities for EFB.
Anyway FAA web site, check out AC 120-76.
Best Rgds