Russell McMahon wrote with mark-up (funny settings there?).  Permit me
to quote my original to see if the links come through intact:

 The Atmel list is very quiet (perhaps an advantage), but useful.
Sign-up data at http://www.ip.co.za/people/kalle/atmel.htm#list .

  No, these others have all changed!

  The Motorola HC11 list, which fields most of the practical HC12 and
HC16 stuff as well, and is tenuously related to HC05 stuff, can be
accessed via http://www.mcu.motsps.com/lit/faq/major.html#zubscribe

>> It is *fairly* busy; perhaps half the traffic of this.

  Well, one quarter (or less) might be a better guess actually.

  The Philips list?  http://www.semiconductors.com/mcu/support/forum/ is
now the recommended entry point.
--
  Cheers,
        Paul B.