I've just added a new guide to the site: Personal Development Blogs List. It's a list of popular personal development blogs, ordered by their Alexa rank. I've been pretty liberal with what can go on the list, and any blog that focuses on helping other people to achieve more is a good fit.
At the moment there are just under 30 blogs on the list, but I hope to grow that over time.
If you have a blog you'd like added to the list, just leave a comment and I'll update things.