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Metalwork

Anvilfire.com is a resource for blacksmiths and related metal workers.

Blacksmith's Web Ring

About Smithing from David Millwater's Blacksmith Shop.
Various blacksmithing links.

Dictionary of metal terminology.

A .pdf discussing the composition and properties of metals.
Engineer Technical Data Reference Tables.
A Cross-Linked Glossary of Some Terms from the History of Metal Working
Development of Damascus Steel.
Damascene Technique in Metal Working
What is Mokume Gane?
Article on pattern-welding.
Pattern Welding/Bladesmithing in Iron Age Europe
Pattern-welding article from Salamander Armoury, showing various patterning styles.
A page on early Scandinavian metalworking; primarily bronze casting.
A useful Links Page featuring metal working and swords.
Smelting
The Dark Ages Recreation Company's various attempts to smelt iron.
The Smelter's Art: Experimental iron production.  And a chance to buy your own bloom.
Metal Workers
Bent Metal Forge
Nimba Anvils: makers of fine anvils.
Bladesmiths
Don Fogg Custom Knives: Crafting and using blades.
American Bladesmith Society
Paul Binns Swords: Various weapons, and pattern welding.
Patrick Barta makes fine historical blades.
ArmArt: Pattern-welding, bronze weapons, and custom orders. 
Manning Imperial is a fine manufacturer of authentic historical reproductions. If you want to get on my good side, gimme an Anglo Saxon pattern-welded sword.
Albion Swords: Hand-made, museum-quality swords.
 Salamander Armoury, maker of pattern-welded et al weapons. Jim Hrisoulas, swordsmith. 
J.F. Metalsmith: Swords and seaxes, pattern-welded.
Jake Powning, Swordsmith.
Armoring
The Armor Society has links on armormaking and armorers.
Page on Maille construction, with links.
Armour Archive
Parts is Parts
McMaster-Carr: Parts and tools.
R.J. Leahy Co.: Rivets and such.
Rivets R Us: Makers of fine vinyl siding.
Jay-Cee Sales and Rivets: I'm sensing a trend here.
Considerable linkage on weapons and armor, including sellers.
Silver Supplies.com: Silversmith and Jeweler's tools and supplies.