Using knife.rb's knife[:region] setting to connect to the correct region when creating a new cluster.  I don't know if this is the actual name of the knife region setting, but it works fine for me for now.
Using knife.rb's knife[:region] setting to connect to the correct
region when creating a new cluster.  I don't know if this is the
actual name of the knife region setting, but it works fine for me for
now.

infochimps-labs/ironfan,infochimps-labs/ironfan,infochimps-labs/ironfan