These stations I do know are no longer broadcasting an analog signal:
WHNW-LP 18 Gary, IN (they flash-cut their signal to digital on channel 18 with the -LD suffix).
WMEU-CA 48 Chicago (they're strictly digital on channel 32, but so far have not converted their digital signal to Class A status).
WCHU-LP signed off their analog signal & broadcasting exclusively on channel 33
