TripTips,uses locals as tour guides for trips you want to take. Interesting idea though I wonder about the quality, and they have limited cities available right now. See also Voyando.
Your Host:
Australia 2004: Curtis Jane and Jenolan Caves
10 Random Photos:
Oregon Coast 2000: Rock Islands
Australia 2004: Hyde Park Walk
Australia 2004: Cave Formation 10
Ballooning 2005: Land and Sky 3
KBCO 2002: Frosty Seamen
Beijing 2001: Hotel View 2
Red Rocks 2001: Day 1: Climbers Topped
Hawaii: SCUBA Racoon Butterflyfish At Mooring
NYC 2002: Macy's
Telluride 2006: Mountain Flower