Shadawyn has a post on headspace (focus) and linked to a related article by Jennifer Crusie.
Keeping my mind on my work is one of my biggest problems; my current solution is to go to a coffee shop on the weekends and to write at work (during lunch and by staying a bit late).
Elsewhere in livejournal, Anghara writes about being a writer and making the decision to be a writer.
I always feel like an imposter when reading those sorts of posts (not that that bothers me). I don’t think of myself as *being* a writer. I write, I want to sell novels, but it’s not some inherent part of my existence the way it seems to be part of other people’s. I never wanted to tell stories, or create worlds or discover people or whatever. I just had these daydreams about made-up people and I wanted to know what happened, but the stories kept morphing and I thought if I wrote them down I could get to the end. I didn’t try to write until I was in college, and I gave up in disgust several times before it occurred to me, at 25, to write really badly and revise later.