Well, this is the grooviest nonfandom thing I've seen in a while -- [Animated] Evolution of Alphabets:
http://www.wam.umd.edu/~rfradkin/latin.html Parent page here, though the others are not as geekgasm-inducing:
http://www.wam.umd.edu/~rfradkin/alphapage.html Also, an *orgy* of links at Manuscripts Images & History of Writing:
http://www.cynscribe.com/mss.html Some of the links are broken (::weeps::) but c'mon!
Medieval Woodcuts Clip Art!
http://www.godecookery.com/clipart/clart.htm Medieval Seals! The stampy kind! Organized three ways!
http://www.nd.edu/~medvllib/seals/ Timeline of Art History!
http://www.metmuseum.org/toah/splash.htmBONUS - Thematic Essays!
http://www.metmuseum.org/toah/hi/te_index.aspSUPER BONUS - Personal Adornment section!
http://www.metmuseum.org/toah/hi/p.htm#po Uh..... ::daintily blots froth from mouth::