I realize this posting is not really computer related nor even Macintosh related but, since it's tough getting through to the actual site (it's so busy), and it seems like a Very Useful Thing, I hope you will forgive this posting if you already know about the Canadian "Do Not Call" service:

...from:
http://en.wikipedia.org/wiki/Canadian_Do_Not_Call_List


Canadian Do Not Call List

From Wikipedia, the free encyclopedia

Canadian National Do Not Call List (DNCL) logo
The Government of Canada announced on December 13, 2004 that they would introduce legislation to create a Canadian Do Not Call List. The Canadian list follows the model set by the National Do Not Call Registry established in the United States in June 2003.
Bill C-37, An Act to amend the Telecommunications Act, S.C. 2005, c.50 was the legislation which followed this announcement. It received royal assent on November 25, 2005 and came into force September 30, 2008. It gives theCanadian Radio-television and Telecommunications Commission (CRTC) authority to establish a national do not call list, to establish procedures to administer the Act and to levy penalties for violations.
Starting September 30, 2008, Canadians began to sign up online at the Do Not Call List website or by calling the toll-free numbers 1-866-580-DNCL (1-866-580-3625) or 1-888-DNCL-TTY (1-888-362-5889). The number of Canadians trying to register on the first day overwhelmed the system bringing the website down eight or nine hours after the official launch.[1]

= - = - = - = - = - =
The official site is at:
https://www.lnnte-dncl.gc.ca/

...try again later if you get the following message (the site is not broken just very busy):
The service is not available. Please try again later.

NOTE: this registers your phone number for DoNotCall but there are some exceptions. (Also from the Wikipedia entry:

Criticism

Professor Michael Geist, an authority on technology, Internet and copyright law and holder of the prestigious Canada Research Chair in Internet and E-Commerce Law at the University of Ottawa has criticized the changes adopted in the amended Act. He observes that the legislation contains too many exemptions. Professor Geist expresses particular concern about the extent and duration of the existing business relationship exception.
On March 28, 2008 Professor Geist introduced iOptOut.ca, a free service which assists in the process of creating a personal do not call list. The service notifies callers selected by the user that the individual exercises his or her right under privacy laws not to receive communications from the notified business. It is intended to cover those organizations excluded from the Do Not Call List.

You need to register on the iOptOut.ca site before you can avail yourself of that service.

Wayne