If you are looking for tips on how to write a great guest post for another blog, Copyblogger has some excellent advice for you:
Write the guest post. Don’t ask. Just do it
Don’t pitch the idea. Don’t ask for permission. Don’t solicit. Just write the best post you can. What’s the worst case scenario? It’s declined. Pfffft! Your work still has value. Submit the guest post elsewhere or put it on your own blog.
Skim through the past 2-3 months of posts
See what specific topics the blog has been hitting recently. See which areas in which they’ve been lacking the past few weeks. Read some comments and find out what their readers want to know more about. link.
You are also welcome to write a guest post on labnol.org.