I keep short storie bunnies in a nice hutch, with plenty of alfalfa and carrots. They tend to breed in there, which makes for more bunnies, with nice hybrid genes.
Between novel drafts, I work on the shorts. I'm starting marketing of my just completed WIP novel, as well as research for the next one. Short stories written simultaneously keep my hand in on actual composition, plus give me more shots at the coveted big markets. F&SF and Asimov's, I'm still laying siege to you. That's my little barbarian tent over there, at the foot of your north tower, and I laugh at boiling oil and arrows. Muhahaha-ouch-ha!