I chose the Blacksmith skill in Dungeons of Dredmor and now have a bunch of ingots. I already have good equipment, so what I can do with all these extra ingots? Is it better to sell them as-is or crafted into items?
Ingots have limited uses outside of forging. They can be:
If you chose to transform then, you should rather make something like bolt from them, in order to obtain more lutefisk from one ingot.
Edit: If you want to sell them, you should before try to craft them into something more valuable, depending on the ingot type:
There may be better deal with cross-metal crafting, but this is what I found for direct metal crafting.
Some ingots also are used in crafting for items only in their raw form. Cassiterite, Hemetite, Malachite, and Zincblende are the four "rocks" that can be crafted directly with other items to make a magic item (as well as forged into ingots for additional crafting instead.)