Font Swapper
In addition to eating pizza, Nick Sherman designs cool interactive stuff.
Over at MyFonts, Nick’s incredible interface is not only for buying fonts, but a jumping off portal for font cataloging and research. At the bare minimum, I like to use my own RSS feed for previews.
Nick’s latest idea: Webtype’s Font Swapper (pictured above).
Type in any (CSS-coded) website, see what it looks like with types from the Webfonts library.