Our Mat-Su Democrats overwhelmed our planned-for caucus location at a bar and grill, where we planned for about ten times a many people as in 2004. What we got - about 100 times as many as 2004 - forced a move to the Wasilla High School Gymnasium.
Waiting to become Democrats:
Voting for Obama:
In Anchorage, it was just as unprecedented, percentage-wise, and far more disruptive, in terms of raw numbers. Steve Aufrecht posted these telling photos:
People coming into Anchorage's Begich Middle School: 
New voters registering as Democrats at Begich Middle School:
Update: Maia, in the comments helped me correct the 1-year date from the 4th to the 5th of February. Thanks, Maia!