Lifehack has a great post on how to maximise efficiency by grouping tasks. The gist of it is that is you constantly swap tasks you waste time in the dropping and re-picking up of a task, e.g. logging in and out of a program, finding the equipment.
Here are a few clips:
Your mind organizes not at a minute level, but by clumping small, related things into cohesive wholes. To the mind, checking email, reading RSS and reading snail mail from the letterbox all end up as one thing—communications processing.
When you’re done, schedule them in groups, saving the most challenging groups and the largest groups for the times of day when you have the most energy, and the fairly low-involvement groups for the start and the end of the day. For instance, checking email and RSS is a fairly easy but productive way for me to get started, so I put that at the beginning of my day and get it out of the way. It gets me into the office routine and by the time those tasks are done I’m awake and ready for the real work.
Perform your grouped task sets on a consistent basis – for weekly groups, do it on the same day at around the same time. For daily groups, do them in roughly the same order. Developing a routine allows your brain to shift those gears more easily, because they know what to expect.