Thanks CapriRacer...
Not to beat this to death, but I just had a look at the two sets of winter tires buried in the corner of my garage:
Bridgestone Blizzak LM-22 - no mention of the word "cold"
Yokohama Geolandar I/T - well whaddaya know, yep they specify that the maximum pressure is 50 psi COLD.
For me, that's only one out of five that specifically indicates "cold". I wonder why there isn't more consistency in the labelling?