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Obsidian is the (or one of the) most valuable stone(s) you can have. Plus, it can be used to create weaponry!
Just the preparations to get the magma forges and smelters up and running.
Also: I've finally figured out what blue (or green) comments mean.
Dwarf Therapist lists them as Legendary +5. They've been working pretty much non-stop since embark.
Slightly goofy since Stonesense doesn't seem to colour obsidian floors correctly: Magmafall Tower
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::shrug:: I guess I didn't need this space after all!