Also, each search engine has links to different sites, so don't get hung up using just one. If you've heard rumors of someone on campus who did an internship that sounds exciting to you, hunt them down and get them to tell you all of the details. Another option is to stop searching for already-organized internships and to create your own. This is a great way to go if you're willing to work for free, are interested in a specific research topic, or are geographically limited to a particular region. Just figure out who you should contact and send them a resume and a nice cover letter, telling your would-be employer why you're interested in their research and why you'd be an excellent candidate for the job.
Chances are, they'll be flattered.
Talk to professors, particularly if you have a specific research topic in mind. They can often refer you to a colleague with comparable interests. If you want or need to be close to home, let your fingers do the walking and check out the businesses and universities in your area. The Alumni Office, if asked, will give you a list of all Whitties who are working in a particular discipline. Just go in and tell them that you'd like to know who and where all of the fluid dynamics engineers from Whitman are, and they'll give you a list .