The conference described below is now over, but follow the links and you will find summaries of the discussion, which are a good picture of what the microfinance community is thinking about.
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You may be interested in this virtual conference on microfinance:
Sessions are from 2pm-5pm GMT every day this upcoming week.
There are background papers and other stuff on the site, which are interesting in themselves.
A video that introduces the conference themes can be found here.
Before clicking, be aware this is a 66Mb MPEG-4 movie, and runs about 20 minutes.
Closely related, with more video of presentations by major players in microfinance and relevant papers here: