“For years, it was a schedule as predictable as a calendar: novelists who specialized in mysteries, thrillers and romance would write one book a year, output that was considered not only sufficient, but productive.
But the e-book age has accelerated the metabolism of book publishing. Authors are now pulling the literary equivalent of a double shift, churning out short stories, novellas or even an extra full-length book each year.”
Read the full article here.
Writers: are you concerned about productivity? How much output is “enough”?
sniderwriter 
I am worried about this which is why I’m finishing a prequel novella and my full length novel at virtually the same time. This way I can release them within a few months of each other while working on the sequel novel.
Smart idea! Will you release the prequel as a teaser before the main work, or as a supplement for readers of the novel?
As a teaser. I’m shooting for a release of that in Spring 2013, then the full length novel that summer.
I might be able to do two books a year once I get going and can do it full-time…maybe. The idea of a prequel is a good one,
That’s what I’m thinking, but even then it seems it would be a full-time job in itself. Doing it now, on top of my day job, seems a little overwhelming.