Thanks for the links! I'll be working my way through them.
A couple more good resources:
http://www.streetfilms.org/
This site is mostly concerned with New York streets, but has a few good videos about Portland streets.
http://www.pbase.com/fangorangutang/portland_or
Several galleries of Portland by Fang-zhou Zhou. He has posted here before, which is how I found his site.