As seen at the Problem Properties Collaborative:
Monday, January 21, 2008 will be the 22nd national King Holiday, a Day of Service in remembrance of Dr. King’s lifelong commitment to his fellow man. This year, Volunteer Memphis/Hands On Memphis will host the 8th annual Martin Luther King, Jr. Summit on Service, a series of events designed to serve as a starting point for meaningful volunteer action and community engagement. Projects will last from 9:30 a.m. – 4:00 p.m. on January 21. Attached you will find additional information and the application for volunteers.
I missed "blog action day" by an hour or 24... but still... go do [PDF].