King County Websites:

Country Records (Document research)
http://www.kingcounty.gov/business/Recorders/RecordsSearch.aspx

Check Taxes: 
http://payments.kingcounty.gov/metrokc.ecommerce.propertytaxweb/PropertySearch.aspx

Property Search
http://www.kingcounty.gov/operations/GIS/PropResearch/ParcelViewer.aspx

Aerial Maps
http://www.kingcounty.gov/operations/gis/Maps/iMAP.aspx

Snohomish County Websites:

Country Records (Document research)
 http://198.238.192.100/

Property Search
http://web5.co.snohomish.wa.us/propsys/asr-tr-propinq/

Aerial Maps (You can easily view this same map under the property search)
http://gis.co.snohomish.wa.us/maps/property/viewer.htm?PIDA=00918700000200&ADDR=00918700000200

As Builts
http://www.kingcounty.gov/filenotfound

Pierce County Websites:

Country Records (Document research)
http://hartweb.co.pierce.wa.us/localization/menu.asp

Property, Maps & Tax record Search
http://www.co.pierce.wa.us/cfapps/atr/epip/search.cfm

Washington State:

Access Washington
http://access.wa.gov/living/index.aspx

Area Code Listings (Nation wide)
http://www.allareacodes.com/area_code_listings_by_state.htm

Public Utilities of the Pacific NW
http://www.ppcpdx.org/in-pubUtilNW.html

Washington State Bar Associations (Real Estate Forms)
http://www.wsba.org/info/lpo-forms.htm

OSPI / Washington State School District Information
http://reportcard.ospi.k12.wa.us/summary.aspx?year=2008-09

WA Secretary of State (Research Corporations, LLC, Home Owners Associations)
http://www.sos.wa.gov/corps/Default.aspx

Condo FHA
https://entp.hud.gov/idapp/html/condlook.cfm