Get out of your office, or off the sofa, or out of the kitchen. Many bloggers find that changing their location helps productivity. You’ll do your best thinking and planning when you’re relaxed. I try to develop posts away from my computer, either at the library, or at a coffee shop.
When you’re looking for ideas, brainstorm, and check your blog’s statistics, but also think about your audience. What’s affecting them? What content could you create to help?
Collect images you’ll use in the coming week, as well as relevant links you’ll include in the body of your posts. If you’re researching, and need to contact sources, do that well in advance — at least a week before you need the information.