For some discussion about Zidisha vs GiveDirectly search "Zidisha" in the comments of these two articles:
1)http://blog.givewell.org/2012/04/26/microfinance-and-cooksto...
2)http://blog.givewell.org/2013/01/04/cash-transfers-vs-microl...
Would love to hear Kurnia's thoughts on this.