Geocaching Web Sites:
geocaching.com
geocachingonline.com
madcacher.com
en.wikipedia.org/wiki/geocaching
geocreed.info
mygeocachingprofile.com

Geocaching and GPS Products:
mygeocachingstore.com
garmin.com
magellangps.com
tomtom.com

Smart Phone GPS Software:
iPhone
Blackberry 
Android 

Geocaching Articles and Information:
History of Geocaching
Geocaching for Families
Geocaching Journeys
Geocaching: Updated Scavenger Hunt
Geocaching for Kids
Geocaching Merit Badge

QR Code Articles and Information:
Wikipedia: QR Code
Kaywa QR Code Generator
SnapMaze QR Code Generator
Social Media QR Codes
QR Codes in Commercial Real Estate

QR Codes Make CRE High Tech

QR Code Applications:
iPhone: NeoReader,QuickMark, & AT&T Code Scanner
Blackberry: NeoReader, BeeTagg, & UpCode
Android: Google Goggles, Barcode Scanner, & QuickMark
Many Android, Nokia and Blackberry phones come with QR Code readers pre-installed.