OSU Career Services - Visit them virtually at this web site or stop by their offices on the lower level of Kerr Administration, B008. A great resource that they have on their site is Career Trail, which positions you to think strategically about the entire major/career exploration and development process -- from understanding yourself and your options to writing an effective resume and developing interviewing and networking skills.
What Can I Do With a Major In... This is a major match web site that can be found on the Career Services web page. It will provide you with career information for jobs that have a relationship to your specific major. See how and if the major you're considering has a relationship to the career you're researching
Major Discovery in Forestry, Agricultural Sciences, and Earth, Ocean, and Atmospheric Sciences - A nice self-assessment tool to help you see if OSU majors in these areas might be a good fit for you.
Occupational Outlook Handbook - The OOH is compiled by the United States Department of Labor.
O*NET online - Find details on occupations through skill requirements or key words
The Princeton Review - The Princeton Review is a student information clearinghouse. It has a career search section. You must register with the web site to use its career database, but there is no charge for registration. Has an interesting career quiz, the results of which provide you with links to detailed descriptions of several careers.
New York Career Zone - Put together by the New York state department of labor. Categorizes occupations into six clusters. Has a pretty comprehensive list of careers, and you can use the links to find some good information, especially in the areas of tasks, skills, knowledge, and education. Keep in mind that some of the info (e.g. salary) is specific to New York state, so it may not be entirely representative of other states.
Career One Stop - A comprehensive source of occupational information, with many links. It even has video presentations for different careers and career clusters.
The Oregon Labor Market Information System - A detailed site with information about the labor market in Oregon. The career information on this site is very "statistic" driven and less narrative, but you still might find something useful. Affiliated with the acinet.org site