I previously wrote about the World Bank's "Doing Business" here. Their new report is out, the overview can be downloaded directly here. The Economist sites a study that is important to note:
"... in poor countries, a ten-day reduction in the time it takes to start a business can lead to an increase of 0.4 percentage points in GDP growth. Another shows that people who have a formal title to their property invest as much as 47% more in their businesses."