The best way (if you want to find one online) is to stick around the boards, post a bit, get to know the community. Then others may see their interests and yours intersect and BOOM you have a potential travel partners, or as we called them here "Meet Ups".
Or you could go solo - which is also highly recommended
Vincent: "So what you gonna do?"
Jules: "Well, basically, I'm just gonna walk the earth."
Vincent: "What you mean 'walk the earth'?"
Jules: "You know, like Kane in 'Kung Fu'...go places...meet people...get in adventures."
Trips (only counting recreational travel):
FIRST TRIP (2005): FIRST EUROTRIP EVER! UK, France, Spain, Italy, Germany, Holland
SECOND TRIP (2007): First Solo Trip! Greece, Turkey, Syria, Spain
2008: China (Beijing, Shanghai, Yangshuo) ...right before the Olympics!
2009: Japan & HK, Southern Spain
[size=1]2010: All over Lebanon, Ibiza (Spain), Oktoberfest (Germany), Thailand.
2011: India (Goa), Jordan, Jerusalem, San Sebastian (Spain), Amsterdam (again), London, Driving from Vancouver to L.A. (stopping in Portland, Seattle, San Fran and all the little stops), Montpellier (France), Geneva and Lausanne (Switzerland)
"Bite off more than you can chew, then chew it."