You might recall that back in May I showed you that Guinness World Records were working on an app. This isn't it, unfortunately. No, today Guinness announced the digital edition of the Guinness World Records 2011. You have all the same content as the paper edition but without the weight.
I've found it on Amazon ($9.99), and I would bet it can be found in iBooks and elsewhere. The Kindle Edition doesn't appear to have audio or video embedded. That's probably a good thing becuase this ebook is already 31MB in size.