I like this idea. Custom workshops are a good idea. Some ideas:
Table or bock: Workbench. Dwarfs work better if they have a table to work on.
Chair: Dwarfs can work better while sitting next to the table. N/A if you have no table.
Coffer, Cabinet, Bin or Bag: Storage. Keeps clutter low.
Barrel or Bucket: See above, but also stores liquids. Buckets will be emptied into barrels of the same type if their is room.
Weapon rack: Tool storage. Having all the proper tools near the workbench speeds up work.
Restraint or Cage: You can still asign things to them, good for butcher's shops and kennels.
Anvil: It realy realy helps with forging. Near impossable to forge anything harder than copper without one. Serves as workbench.
Bellows: (needs implemented first) improves work quality at forge/kiln/smelter. A dwarf other than the one doing the smithing uses this.
Furnace: Built from blocks, this is a good place to put metal/glass while you heat it.
Oven: Like furnace, but for cooking.
Well, river or channel: If the workshop uses water, this will supply it.
Magma: Free, in-shop heat source. Steel container needed to move magma around the workshop.
Loom: Built at a metalsmith's or a carpenter's shop. Saves your dwarfs the effort of weaving cloth by hand. If it has no power source, dwarfs use a handcrank. Serves as workbench.
Sewing wheel: See Loom but for thread.
Mill: See Loom, but for milling.
Big sawblade: See Loom, but for wood cutting
Crane: Used in larger workshops to move realy heavy things like seige engine parts, live elephants, heavy furniture and ballista arrows around the workshop without needing to lift them. Can be used to load things into carts (once carts a wheelbarrows go in)
Conveyer belt: Like a crane, but along a set path.
Waterwheel: Powers one of the above devices, built in a river. Built with mechanisms.
Mule powered turning thing that I forget the name of: Powered by animals or dwarfs walking in circles, can power the above devices. Built with mechanisms.
[ June 27, 2007: Message edited by: Grek ]