MaRS Startup Toolkit ExternalThis web site was created by MaRS, an Ontario company so it tends to have slightly more Canadian focus. However, there is quite a bit to interest to those starting a business in the United States. It includes resources for all areas of starting a business including business models, finding U.S. (and Canadian) market data, finding competitors, etc. It does have a high focus for those interested in starting a technology company.
The Startup Toolkit contains articles, reports, workbooks, reference guides and videos covering a range of topics, including accounting, funding, governance, intellectual property, leadership, legal issues, marketing, product management, selling, social innovation, strategy and talent.