This site is not going to be a surprise to a lot of folks but this forum is great!... well a close second to our own maybe ;)
http://forums.armourarchive.org/phpBB2/
If anyone ever needs to totally glut their brain with all that armourers have ramble on about this is the place gorge. It is however studded with some real gems. I have to count this photo essay in the creation of an Italian gothic harness one of the most informative armour bits I have ever seen on the internet. Patrick Thaden is a really talented guy.
http://forums.armourarchive.org/phpBB2/viewtopic.php?t=43459&highlight=