Every so often out of sadness comes a truly inspired idea. The origins of X-Clacks-Overhead may just be one such moment in geek folklore. It is very fitting that the name of Sir Terry Pratchett should live on in a very subtle manner following one of the ideas from his own stories – keep sending out his name as part of the actual machine overhead itself. Forever.
For details, see http://www.gnuterrypratchett.com/
My own set of discworld books have faded covers, from many years on and off bookshelves, but are now being read once again.
GNU Terry Pratchett