HP Dorkery
I'm not sure what possessed me, but the other day I went looking for some Harry Potter fonts and as you can see, I found them.
Turns out, there are a ton of options if you're looking for HP typography. To install a font, I normally just unzip it and extract it to C:\WINDOWS\Fonts. Then I double click it to install it. But there's more kosher ways of doing it. I have to admit that I've never installed a font on my Mac, but it shouldn't be too hard.