My website is a personal reflection of our experiences. If you want a more balanced read I would recommend the superb Bradt Guide – Greece: The Peloponnese which in my opinion remains the best [and only standalone] detailed guide to the area. Edition 4 is now out with subtle but helpful additions and improvements.
You should also read the trilogy of books and novel by Marjory McGinn. Her books focus mostly on The Mani and are a great read. Marjory also has a blog which is a good source of info about the area.
Blue Skies and Black Olives by John and Christopher Humphrys is laugh out loud funny and documents the trials and tribulations of buying a house in The Peloponnese.
Then there is of course the classic Mani: Travels in the Southern Peloponnese by Patrick Leigh Fermor which is still available in paperback.
I also recently stumbled across the TravelnWrite blog which is well written and informative and has some interesting features on The Peloponnese.