Ballot Access News: California Bill to Try All-Mail Voting in San Diego County

"California State Senator Christine Kehoe (D-San Diego) has introduced SB 304, to let San Diego County use all-mail voting for the next five years. At the 2000 census, San Diego County was California’s third-most populous county, and it is possible it is now the second-most populous county."

http://www.ballot-access.org/2011/02/16/california-bill-to-try-all-mail-voting-in-san-diego-county/ 

The state of Oregon has already used mail-in voting in its elections.