Following Zoe's good example and using the list of addresses she provided, I emailed the MHRs over the weekend about the passing of the Private Members Bill on RU 486 and the TGA.
Here are the replies I have had to date (not including a number of Out of Office Auto-Replies and 'your email has been brought to the attention of X' type replies):
Trish Draper: detailed explanation of position: NO
Julia Irwin: brief personal reply saying 'I support your comments 100%': YES
Kim Wilkie: detailed explanation of position: YES
Rod Sawford: brief personal reply, clear and unequivocal support of Bill (and my own MHR, yay): YES
Lindsay Tanner: clear indication of intention to support Bill: YES
Tony Windsor: courteous, cautious reply about the value of feedback from the electorate: NON-COMMITTAL
So far, so good.