Defragging your work week

I've been experimenting with ways of getting more done with my days lately along the lines of Jeremy Zawodny's Removing Distractions at Work. Mostly this is because I have become desperately busy and as a software engineer, anytime your not at your desk building things you have to ask yourself why. My focus has been on eliminating interruptions that cause me to have to context switch my attention away - extended periods of focus are key. No single interruption is a problem but in aggregate, you find yourself spending a lot of time getting back to where you started. Along those lines:

• No IM Clients and check email periodically - every few hours
• Don't answer the phone unless it's something you know you have to deal with - once people can't get you on IM, they start calling. Making people walk to your desk usually filters out the frivolous stuff.
• Strictly limit the number of meetings you go to and know when to eject! I'm a big believer that meetings should be an event with a fixed agenda and a specific goal. The reality is that meetings have become so common place that people are often late or do other things in them. I've also noticed that if a meeting is scheduled for an hour it invariably lasts an hour - people will just fill the available space. Having short 10 minute meetings is usually a better way to go. Also, the number of people at a meeting is usually inversely correlated with how useful the meeting is.
• Make yourself available for distractions at least part of the week - this isn't about ignoring people, it's about defragging your schedule.
• Work early mornings and weekends - zig when everyone else zags