Based on @Clive's comment here, I'd like to know more about how we're supposed to be tagging Commerce-related questions. My initial thought was that since Commerce is only for D7 and is not a candidate for backport to D6, Commerce-related questions should be tagged 7 as well as Commerce. Also, when Commerce is released for Drupal 8, it will probably be significantly different and many of the old D7 answers will not apply; hence, having that information available (i.e., that the questions related to the D7 version) will be helpful.
Should Commerce questions right now always be tagged 7? Never be tagged 7? Sometime's be tagged 7?