The IDLE Method: Identify the clutter category, Decide how to delcutter, Locate or let go, Evaluate your clutter rules.
The FAST Method: Fix a time, Anything not used in 12 months goes, Someone elses stuff, The Trash can is your friend.
Declutter 101 from Organized Home (the Four Box method)
Clutter 101 from Simple Productivity
Clutter 101 from Organize It
Clutter Busters from Maria Gracia
52 Weeks to an Organized Home from Home Storage Solutions 101
Declutter Your Kitchen (printable pdf)
A Decluttering Checklist from the Daily Planit