Summit Post article on Compass Basics - Great site to review map and compass basics.
NOAA - Magnetic Declination - Great text and video describing magnetic declination.
Natinal Geographic All-Trails - Great free source of trails in the Portland Area.
Link to Download Google Earth - Great App to have on your phone or program on your computer.
Geocaching.com - Over 3800 geocaches just in Portland!
Columbia River Orienteering Club - They have quite a few Mt. Tabor orienteering events throughout the year, especially in the Spring.
andrewskurka.com - A great through-hiking site with lots of information on map and compass.