I'm following a new regimen for writing, and so far I feel it's working. Here's what I do: I limit myself to email/blogs/Facebook, etc., for the first 15 minutes of an hour. After that, I write.
I also do a quick outline of what I'm going to focus on during my writing. Then I just sit down and do it. My output has increased and I'm finding the energy again to work on things for a long period of time.
Stay tuned. We'll see if I can make this a habit.