Your interest may be in a functional area, such as marketing, that you could perform in a variety of settings. Or, you may be interested in working within a specific industry, for example banking or health care. Perhaps you are most interested in opportunities within the nonprofit sector.
Many web sites combine information about industries with information about specific companies.
Print versions of their reports can be ordered, or condensed versions viewed online. Wetfeet Press provides a similar service of industry overviews and information. Action Without Borders gives a good introduction to non-profits with links to the homepages of over 15,000 different organizations, jobs and internships, volunteer opportunities and other information.