Ben,
I'm all for anything that helps students realise they are not in their own classroom, but I don't think that particular suggestion would help more than the inclusion of the information on the log in page (that has already been done). The capacity of human beings to ignore written instructions is impressive ;)
A guide for Adult Learning purporting to be in Plain English has been lambasted for gobbledegook, and in the processs, Moodle's name has been taken in vain, see http://www.guardian.co.uk/education/2009/may/10/councils-gobbledegook-plain-english-campaign
An interesting story but what can we learn from it? I think it's good to think about implementations of Moodle as <name> powered by Moodle rather than as our Moodle. This might also help with our periodic visitations of students who think they're at home when really they're here.
Perhaps we should also capitalise MOODLE though I do remember it as a name rather than as an acronym.
I am not quite sure what you are asking for. Could you give a bit more detail and then you might get some answers?