I don't know if this website was ever posted here; but I just used it and again noticed how usefull (and fun) it is.
It's certainly the best coat of Arms creator I've ever seen online. It's a bit less user-friendly than most, but thats mainly because it has so many options. Once you've got the hang of it, its great.

http://www.inkwellideas.com/coat_of_...ee_coads.shtml