As of July 2008, 19 U.S. carsharing programs claimed 279,174 members sharing 5,838 vehicles. As of July 2008, 39,664 members shared 1,667 vehicles among 14 carsharing organizations in Canada.
That's a 23:1 national member to vehicle ratio in Canada and 47: 1 ratio for the US.
And rumors of impending moves by car rental companies into carsharing are keeping the news media busy.
USA Today, 9/29/08: Car rental companies get into the business of sharing (Thanks for the use of the photo.)
Wall Street Journal, 10.1.08: Battle Looms Over Carsharing