You might find Roy Peter Clark's fascinating Writing Tools: 50 Essential Strategies for Every Writer helpful. If you've low on cash, but have iTunes, you'll also find him at iTunes U with a podcast version of Tools. Each podcast discusses one tool and only takes a couple of minutes. This podcast is sponsored by the Poynter Institute so just search iTunes for Poynter and you'll find it. You might find another Poynter course - The Practice of Journalism: Writing and Editing - interesting too.