I'm self-employed and make it a point to sit down and start working at the same time each day, just as if I had a normal job. That's not always enough. If I find myself reluctant to start a task I pick something easier, maybe even fun, and start with that instead. That usually pulls me in and gets me rolling.

The Tron soundtrack has worked well for me too as far as music. I was tired of it but then discovered the two-disc version and extras (15 extra tracks)