From the Oregonian newspaper: http://www.oregonlive.com/politics/index.ssf/2009/06/online_voter_registration_pass.html

Oregon joins a number of other states who are moving to an electronic online voter registration system.  The hopes are that this modernization of our registration system will reduce data entry errors, speeed changes, and reduce pressures on election officials on election day (in Oregon, most of the lines the last few days before an election are voters who need to update their registration record).