Tom Woods talked about it briefly here. He likens it to predicting that the soda you put in the refrigerator will get cold.
Here’s some sources:
Krugman DID Identify the Housing Bubble in 2005
Paul “Hair of the Dog” Krugman
Krugman’s Intellectual Waterloo
Krugman and the Housing Bubble: A Love Story
At This Point Paul Krugman Is Just Playing With Us About Housing
Paul Krugman: Housing bubble instigator, not predictor
Not exactly on this topic, but just for good measure: Bubble predictions: better late than early