Login to Business Insights: Essentials.
You'll then be brought to a list containing a wide variety of industries:
Clicking on the links allows you to read essays, overviews, and key information about the various industries. In addition, you will often find links to academic journals, industry associations, magazines, and more:
Login to S&P NetAdvantage. Once you're in the database, click on the Industries tab:
You'll then be brought to a list of industries:
You can then click on either the HTML or PDF file to obtain overviews of a wide variety of industries: