Quoting Michael Paoli (Michael.Paoli@cal.berkeley.edu):
A) know your audience/list. I'd think that's probably fine for SF-LUG. I don't know the lists of the others well enough to specifically comment on those. B) "reminder" - particularly to other than BALUG list(s) is probably better appreciated and/or tolerated if it's short and sweet - e.g. it can be a very short mention and include a URL to a) the BALUG URL where the information is readily viewable and/or b) URL to the previous publicly archived message that was sent to that group/UG/forum.
Sounds highly reasonable to me.