Ooo, plenty of great articles continuing to come out of this thread! Keep up the good work all!
Here's one I wrote a couple of weeks ago which asks you to challenge your approach to attempting to understand your existence:
Do you really want to know the Truth?
And here's a guest post by Jenny which gives a good non-technical introduction to the science behind change in the realm of personal development:
The Science Behind Change: A Beginner’s Guide
Enjoy!