I'm lucky in that my son is into reading "Captain Underpants" books at the moment, which are a literary gem. Will I be spared these "Twilight" things, or are they not just for girls?
We've read the first few Harry Potters together, but I think that he needs to be a bit older for the next ones. I think that the HP books are good but not great - and that much of the pooh-poohing of them is a reaction against their disproportionate success.
I'm not sure about ebooks for children - I think that I'd want a more indestructible device before handing them out to a class of primary school kids.