Yeah the ballot are mailed today according to this source:
http://www.sfgate.com/cgi-bin/article.cgi?f=/news/archive/2004/10/13/politics1242EDT0537.DTL
"While other states pursue high-tech voting machines in hopes of avoiding a repeat of the Florida fiasco of 2000, Oregon proudly continues with its uniquely low-tech system of voting by mail.
Oregon abolished polling-place elections in 1998. The result is that Election Day 2004 in Oregon will actually be a 19-day affair that begins Friday with 2 million ballots being sent to the homes of registered voters. "
I think I like that idea. Wonder how fraud is affected by this system.