Here are some armour links that I have compiled. I will add links as I find them.
Arador Armour Library This is an excellent resource for armoury
Arador Armour Discussion Group Another excellent resource for armoury.
Knight's Armoury This is an excellent resource for medieval weapons and armour.
'Chain' Mail Production Techniques
as taught by Duke Manfred Kreigstriber - while certainly not the best designed page I have seen, it does have some useful info. If only those darn figures were better made . . . Worth a look see if you want to know how to lengthen or shorten a row.
Sara's Chain Mail Armour Links Page - I hate to have a link to a links page, but it is a good resource
Chainmaile Construction - I don't know who does this page, but there are a couple of good tips interspersed throughout it. It is a bit sparse, but he seems to work on adding stuff periodically, so it might be worth your time to check it out.