Extra! Extra! is an app which shows you the front pages of newspapers around the world. I've been playing with it for hours today already, doesn't get old. Of course the informational part is less interesting to me (how much info can you get from a front page anyway? How much info is recycled across all newspapers?), but it is THE app to drool over the fonts, since it offers true high resolution (PDF?) front pages, updated daily. Not to mention that you get a glance at the layouts without having to go out to the next international news stand. It is a pleasure to use on the iPhone 4, I'm sure it's even better on the iPad.
Some screenshots (yeah, I'm a sucker for anything Christian Schwartz and Cyrus Highsmith)