We went to the local INS field office today and as the notification letter instructed, we took with us three recent ADIT style photos, current greencards, and passports for my wife and daughter. When our turn at the window arrived the INS clerk took all, got a signature and fingerprint for wife and daughter, wrote extensions in the passports, and sent us on our way. Total time spent .... maybe 10 minutes. The new unconditional greencards will arrive in the mail.
A special note ..... the notification of approval letter instructed us to take three photo's each for my wife and daughter. The INS clerk in the office only required two each.