The (free!) typefaces below may not have a place in many graphic designers' playbooks -- see this list for some of those -- but that doesn't erase their novelty factor for us.
To install a new font on any Mac with OS X 10.3 or above, simply double-click the file once it's finished downloading and click "install." You may also place the file into the folder "Users/[Your Name]/Library/Fonts."
Windows computer users will have to extract the font files beforehand by double-clicking the .zip file to expand it. With version 8, 7 or Vista installed, you'll then be able to simply right click and select "install." More details on downloading and installing your brand new fonts are available here.
In the meantime, here are those famous (and free!) fonts you'll want to start using immediately: