The Polsky Center for Entrepreneurship has some amazing resources: http://www.chicagobooth.edu/entrepreneurship/
The Booth School of Business has at least 6 Nobel Laureates as professors: http://www.chicagobooth.edu/
The New Venture Challenge (http://research.chicagobooth.edu/nvc/) has launched companies like http://grubhub.com, http://benchprep.com, http://bu.mp, http://www.braintreepaymentsolutions.com/, http://www.prepme.com/, etc.