Reference
Tempus Peregrinator's Little Heraldry Book
http://www.theweebsite.com/heraldry/contents.html
Heraldic Primer
http://heraldry.sca.org/heraldry/primer/
Assorted Lessons in Heraldry
http://heraldry.sca.org/laurel/lessons/lesson01.html
Heraldic Dictionary
http://www.rarebooks.nd.edu/digital/heraldry/
A Herald's Toolbox
http://heraldry.sca.org/laurel/htoolkit.html
Blazonry - the language of Heralds
A Grammar of Blazonry
http://heraldry.sca.org/laurel/bruce.html
General Information
Heraldic Display
http://andrew.draskoy.net/sca/eilean/display/
(There Must Be) Fifty Ways to Use Your Arms
http://coblaith.net/Heraldry/50Ways/50Ways.html
The Law of Arms in Mediaeval England
http://heraldry.sca.org/laurel/lexarm.html
The Academy of Saint Gabriel
The best place for names!
http://www.s-gabriel.org/
Articles on Historical Heraldry
http://coblaith.net/Heraldry/
Heraldica
http://www.heraldica.org/
Entertainment
(Either humorous or 17th+ century)
"I just received today a copy of Alexander Nisbet's "A System of Heraldry" (1722) that I had ordered, and to my surprise it does indeed say that the display of a shield in the tilted (pendant or accouche') position was limited to persons of tournament rank, i.e., noblemen. Nisbet states that arms of sovereigns are never displayed this way because they did not actually enter the lists. (I believe that is an ahistorical statement, but there it is.) "
Heraldic concepts
http://www.crwflags.com/fotw/flags/heraldry.html