It's great fun playing with the desk-top publishing we do at the library--futzing with all the signs, brochures, and bookmarks we need in the course of the year. Ever since I can remember, I've loved letter forms and can get very involved with finding the perfect font for the theme. Here are some fun font websites:
Fonts for Kids! Definitely not just for kids, this site has lots of free and very useful fonts to download. A big bonus--it's free of annoying pop-ups, which many other font sites are not.
Identifont Want to identify a font based on a line of two of copy? This site will ask you questions about the characteristics of the font in question and narrow down the possibilities.
Walden Font Co. These fonts aren't free but include a wide variety of historical looks and antique-y handwriting fonts.
Fontifier For a small fee, this site will make a font based on your own handwriting.