Register now to keep telemarketers away.
Unfortunately, the list of exceptions contains some of the most annoying telemarketers, including long-distance phone companies, airlines, banks and credit unions, political organizations, charities, telephone surveyors, or companies with which you have an existing business relationship. Also, the law only requires telemarketers to synchronize their databases with the national database every three months--meaning a long delay before you get those pesky callers off your back.
Still, this seems to help reduce the volume of calls, even if it may not do so as significantly as people may wish. Now we have to see if the law and the registry will survive the inevitable court challenge.
The New York Times has more here.