Quickly preview all your installed fonts online
Head over to the site and within seconds it will render a table of all your typefaces. Initially the preview text will read "flipping typical," but you can delete it and enter whatever you like. To swap the primary font at the top of the page, simply click on the one you'd like to view full size. You can also switch the previews to bold and italics via hotkeys (control-b and control-i respectively).
Flipping Typical should work just fine on Windows and OSX with just about any browser except IE6.