This article may seem somewhat off-topic for this blog, but it is at least partially relevant for those of us who use their iPad for presenting:
One of the limitations of the iPad (and other iOS devices) is that you are stuck with the fonts that Apple provides. There is no official way to add custom fonts. I'm usually somewhat conservative in my choice of fonts anyway, but sometimes, it would be nice to have a fancy font for special effects.
A developer has now found a way to install custom fonts on devices running iOS 7. It is in no way officially sanctioned, so it may stop working at any time with a future iOS update. On the other hand, as I understand it, it's not really a "hack" either, since it uses a feature that was only introduced in iOS 7 (though maybe not for this purpose).
In any case, the app is called AnyFont and you should use it at your own risk.