One of many interesting details is that women get the majority of the loans because they're usually far better credit risks.
That's not particularly impressive from a financial standpoint, but it's certainly not a charity. It's more than most Web 2.0 startups make, after all.
There is no feminist agenda. Grameen lands mostly to women based on their own experience showing that: 1) Women are more likely to pay the loan back; and 2) Women tend to invest the loan in long-term basis (ex: buying a cow to sell milk). The fact is that women are highly marginalized in developing countries, and men magically starts to listen to them when they somehow are able to make decisions without the men's approval. Women have a vested interest in the loan, and therefore they tend to be better payers.
Don't believe on such "experts" -- If their theories were right, developing countries would be prosper by now :)