Another very simple thing I use when procrastination strikes is Seth Roberts Magic Dots technique. ( http://blog.sethroberts.net/category/procrastination/magic-d... )

He came up with it based on reinforcement studies in pigeons. There are more details on the linked page, but basically whilst working you just put a dot on a piece of paper every 6 minutes in the shape of a square, then join all the dots with a line. Something about doing this essentially meaningless thing improves motivation and throughput for me.