This is a little off the beaten path and US-centric. But, I thought it was important enough to merit blog space (and typing time). The US National Do Not Call Registry began in June 2003. If you signed up then, the 5-year registration period will end for you mid-2008 unless you re-register at...

NATIONAL DO NOT CALL REGISTRY

You can read about this in the Yahoo! News AP article Do Not Call listings aren't forever.

This has been a public service announcement :-)