Small Notebook. It is one of my favorite blogs on tips on how to live simply and declutter.
Frugal by Choice, Cheap by Necessity. Highly entertaining blog about a family living happily and frugally.
Zen Habits. Another minimalist blog by Leo Babauta who lives as minimalist as he can go with a family.
The Non-Consumer Advocate. She tries as hard as she can to not buy anything new if it isn't absolutely necessary.