Vulnerability in Mission

With a very interesting group of people from around the world, I'm currently working on some research that might see the light of day next year - at the Edinburgh 2010 Mission Conference. The idea is to look at how people get motivated for and caught up in Christian mission - how they go about it. One of the issues we were talking (well, virtual talking) through yesterday was vulnerability in mission. Jesus was quite vulnerable at times (how else did he get crucified?) and Paul has quite a lot to say about vulnerability, and yet Christians often go about mission in quite powerful ways - linked in with colonialisation, globalising materialism, or 'power evangelism'. I had a quite challenging/difficult meeting last week with a Brit. who is absolutely committed to vulnerable mission - living simply, using local resources, speaking the local language, having no more power than any local person - in western Kenya. Jim really works hard at this 'being vulnerable' but its not easy. His skin colour alone manks him out as one who has access to those with financial resources and power even if he does not have them himself. I also found out about him on the internet and met him in Wantage, UK. No one else from his village in Kenya has a web presence or flies to the UK! So what does 'vulnerability' mean in terms of mission? I'm still wrestling with that one.