Was doing some research for a small group leader at GCC for summer student mission for 2004. Looking at things that fit his criteria as well as being strategic, progressive (preparing his team for 2005) and taking care of logistics (meals, housing, etc.). Found some very cool other sites as well:
K - this one is for you. Destination Summit - Part of New Tribes Mission - specific to reaching the unreached.
Network for church planters among the unreached
Reaching the unreached people groups of NYC