Because I don't know everything about simplifying, here are links to a bunch of people who do. You'll find all schools of thought on simplifying...going green, full on minimalism, decluttering, the simple family, and natural/DIY #allthethings. They definitely have valuable contributions to our conversation about simplifying!
The Art of Simple - tons of well written posts!
The Tiny Twig - her mantra is "Less Fuss, More Passion"
Shalom Mama - simple natural living...they live in a bus (for real)
Greater Than Rubies - all about creating a simple, hard-working wardrobe
The Minimalists - they're super serious about minimalism
Zen Habits - Leo is basically the minimalism guru
Goedeker's Home Life 101 Steps to a Simpler Life post
Hayley Morgan's The No Brainer Wardrobe eBook
Jen Hatmaker's 7: An Experimental Mutiny Against Excess
Richard Foster's Celebration of Discipline
Joyce Meyer's 100 Ways to Simplify Your Life
Cynthia Herald's Becoming a Woman of Simplicity
Richard Swenson's Margin
Jim Congdon's Simplify Series (our local pastor :) )
Andy Stanley's Breathing Room Series
Graham Hill's Less Stuff, More Happiness TED Talk
Articles in The Simplified Series
If you have a resource that you think would be a good addition - please let me know!