Essays about design -- in German (Google translate to English is clunky, but gets the basic idea across). The essays about design in free fonts -- along the right side of the page -- are of particular interest.
Use you own text to randomly generate colorful typography images 300x400 and 640x480. Great for those you need something colorful for an idea that's hard to represent graphically.
This web site provides information about Unicode fonts, Unicode-enabled software, internationalization, and Unicode usability issues on free/libre/open source (FLOSS) operating systems.