Some nice obituaries:
The New York Times.
The Financial Times.
Catallarchy: "RIP: Milton Friedman (1912-2006)" and "Milton Friedman Video" (the latter posted by his grandson, Patri Friedman)
Long or Short Capital: "Long Milton Friedman."
David Friedman's Blog. (Milton Friedman's son)
The Agitator: "Milton Friedman, RIP"
Technology Liberation Front: "RIP Milton Friedman"
The Only Republican in San Francisco: "Friedman passes away"
UPDATE (November 27, 2006):
Catallarchy has produced a series of postings on various aspects of Milton Friedman's life and work from different perspectives as a tribute.