Get your writing style to the next level

Many people may already know about these, but I thought I should share them with the rest:

• Copyblogger: copywriting tips for online marketing success.The blog contains tones of information about how to improve your writing style, your presentation skills, etc.
• Presentation Zen: a blog on issues related to professional presentation design
• Creating Passionate Users (the blog title says it all).

I have a couple more with the same flavour but I will have to distill them firstly.