If you enjoy Brian Johnson’s PhilosophersNotes, then you’ll probably also get a lot out of bookoutlines.
From the front page:
“The purpose of this wiki is to allow readers to contribute to a community repository of book outlines. Whether you’re here because you’re too cheap to pay for Cliffs Notes, or because you want to be able to better remember your favorite books, welcome.”
While it isn’t focused specifically on personal development, there are quite a few titles that you may be interested in. I was pretty jazzed to find notes on:
- The Art of War by Sun Tzu
- How To Win Friends And Influence People by Dale Carnegie
- Rich Dad, Poor Dad by Robert Kiyosaki
- Simpleology by Mark Joyner
- The Greatest Salesman in the World by Og Mandino
- The Greatest Salesman in the World Part II by Og Mandino
- The Millionaire Next Door by Thomas J. Stanley and William Danko
There are 78 titles on the site at the time I’m writing this… hey, no wait…
There’s more! 
Now there are 79… I just added a brief summary of Success Through a Positive Mental Attitude by Napoleon Hill and W. Clement Stone. I’m pretty new to the site, and it’s a very brief outline… we’ll see if the other users decide to keep it there. 
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You may also want to take a look at Shmoop – they are trying to make learning more fun and make you a better lover of it.