Marco Arment being interviewed by Stephen Hackett at 512pixels:

Two years ago, I was a web programmer with a little iPhone side business and a tiny blog for fun writing. Today, I’m a predominantly iPhone programmer with a minor web component, and I have my blog as a little side business. Maybe in the future, I’ll primarily be a writer with a small programming side business.

Marco is a pretty high benchmark for “success.” Having those multiple skill sets outside of what you think you traditionally do is a huge asset to anyone’s future career. At times it may feel like you’re writing to no one, but keep at it – it pays off in the long run, in ways you may have never imagined.