Over the weekend, Fantasy Faction had a great write-up and review of all the Powder Mage short fiction so far. There are plenty of people still on the fence about whether to get into them, so this might help sway you!
Someone made a comment on my Facebook page that they'd love to see prequels to the Powder Mage Trilogy. FYI, the short fiction pretty much are the prequels. I don't know if I'll ever expand to novel-length works during that time period of the universe, but I'll definitely be writing more novellas. I think they work better for the purpose of expanding the universe.