I know I wasn't alone last week in telling you about The Guardian's iPad App, but I did pass over telling you that it was launched shortly thereafter, figuring that you'd probably already heard about that from somebody else.
Whether you own an iPad or not (and I'm sort of guessing that most of you don't - yet), I think this is something you need to take notice of. Especially if you're a designer for either print or web, or both. Because this is something else again. Which makes it jolly useful that Aegir over at the Ministry of Type has written this very thorough review. I'd go over there and read it carefully, if I were you.