Links to other friendly missions in East Africa:

TIMO - Training In Ministry Outreach - two year intense field training
CMF International - training indigenous church planters
Joshua Foundation - advanced pastor and teacher training

Things to do while in Arusha:

Dustbuster Adventure Safaris - not for the faint of heart
Tanzania National Parks - more conventional safaris available
Tourism in Tanzania- official Tanzania Tourist Board site
Tour Operators in Tanzania- look before you leap (or write and ask)