Orbit Books have just announced they'll be electronically publishing short stories from their authors. This provides both a new product to sell (for author and publisher) and promotion for the authors' longer works, ie their novels. I think this is smart. SF&F readers have a tradition of short stories, and online short story ezines.
It does make me wonder though--buy a short story from one author or support an ezine that supports many authors (many of whom aren't already published names)?
Fortunately I think there's room for both options in the market.