The thing I like most about Gretchen's approach is that she quickly decided (after laborious research on the subject, the likes of which only a true book-writer could accomplish) that the only way to be happier was to be truer to herself. She doesn't try to become a different person or someone she's not; she just becomes more her.
Also, she's writing a book of the same name due for release later this year! I've had the oppurtunity to take a peak and it provides all that her blog does and more. Not to mention, she's a great writer; straight-up, self-deprecating and well-read, just like I like 'em.
So yay Gretchen Rubin! Go check it out :)