Recently I saw a reference to Standard & Poor's Shariah compliant indexes, most of which started in 2006 and 2007. Shariah is Islamic canonical law which observant Muslims follow in their daily lives. Certain investments and practices are allowed, others, such as charging interest, are not. There is increased interest in such investments and this method of finance.
Standard and Poor's offers an explanation about their methodology and screening of possible investments. A general search for Shariah on the S&P website will retrieve other explanations.