Here are some of our favorite links . . .
Organizations and Government
in alphabetical order
Allegheny Front Trail - near Julian, PA
Appalachian Trail Conference
Blue Mountain Eagle Climbing Club - based in Reading, PA
Keystone Trails Association
Otzinachson Group of the Pennsylvania Chapter of the Sierra Club
Penn State Outing Club - University Park, PA
PA Department of Conservation and Natural Resources
Warrior Trail Association - Greene County, PA

Vendors
Altama - boots, footwear, mil-spec and civilian
Brigade Quartermasters - source for mil-spec clothing, more
Camelbak - water carriers and daypacks
Cheaper Than Dirt - name says it!
Emergency Resources - sellers of equipment designed for emergencies,
but a nice resource for outdoor activities as well
Garmin - makers of eTrex and other GPS units
The Ingredient Store - vegetarian and dehydrated foods, trail mix, recipe chat and more
Leki - trekking poles
REI.com
- Excellent source for commercial hiking gear and other equipment

Web Sites
Trailsource.com - tries to be comprehensive, and does a pretty good job if you're new to an area
HikingPA.com - not to be confused with HikePA.com :-)
HikePA.com - information on hiking in Central Pennsylvania
ClimbingGearInfo.com - "comprehensive guide to climbing gear" contains a few dozen articles on various equipment with vendor links