Apartment Ratings Seattle: http://www.apartmentratings.com/rate/WA-Seattle.html
Craig's List: http://seattle.craigslist.org/apa/
NW Classifieds: http://classifieds.nwsource.com/classified/
Seattle Coop Housing board: http://seattlecoops.org/housingboard/list.php?f=1
Seattle Temporary Apartments - http://asuites.com
Rent.com Seattle Rentals: http://www.rent.com/washington/seattle-apartments/2-1021