I'm in the UK and as wondering how buying ebooks works. Is it possible to buy an ebook from amazon.com for the kindle and read it on my iPad in the UK? Can I get Ebooks from websites such as Waterstones (a UK bookshop) and then get it on the iPad, or would I have to purchase from iBooks, the Kindle app or Stanza? Or are these just apps that allow you to read books? You can see i am confused, i am just trying to figure out the limitations of ebooks.