Following is a list of the fonts used on this site.

If the names of the fonts are in different fonts than the rest of the text on the page, then you've got them and you're good to go! If not, to view the site as it was intended please download the zips and install them into your Fonts folder.
Just click on the text link to donwload. On occasion, you may need to go elsewhere to download, depending on the terms of use stated by the designer(s). If that's necessary, I'll make a note here.

Garamond - This is the biggie. Most of the site utilizes this one. It's also the font in the published HP novels. I believe it's standard on most computers these days.

Fontdinerdotcom Loungy - Funky, retro-style to go with the Las Vegas lounge-act vibe of the site. From, you guessed it, fontdiner.com.

SpookyMagic - Another funky font that goes well with the lounge-act style, as well as the magical theme of HP. This one's from Gaut Fonts @ typOasis.

Viner Hand ITC - Script-like, handwriting font with a Slytherin feel to it. I'm pretty sure this one's standard as well.