There was an old thread of this, but I can't find it, so I'm starting a new one.
Leatherworking:
Slings. Bodak hide could give +1 AB vs undead, and for those ghoulish enough to skin a lycanthrope alive for the hide, that could be +1 ab vs shapeshifters
Normal clothes template. Soft patches only, no AC bonuses.
Woodworking:
Copper, iron, and silver used in crossbows should give +1 AB vs fey, outsiders, and shapeshifters respectively.
Wereshark bones once Blaustein is in, for +1 AB vs shifters composite bows
Clubs and quartestaffs.
Smithing
Darts. Copper, iron, and silver give +1 AB bonuses vs fey, outsiders, and shapeshifters. Iron and Steel give reduced weight. Steel gives +1 damage.
~Requires 1 ingot (5.3 pounds) per stack (5 or 4 pounds, depending on type)
For all:
Masterwork Items. (Though, anything beyond the current system may admittedly be better left to enchanting, it's an option)
~DC +40
~Template cost x100
~Bows and steel smithed weapons gain +1 AB
~Armours gain an additional +1 AC