To search for programs by subject, try: http://international.gradschools.com/
Bear in mind that this is a commercial site. The schools at the top have paid to be there, but schools do not have to pay to be listed. This site does not provide much information about the schools; once you find a school of interest, try the website and the school's catalogue (see below).
Another commercial site that offers useful links and information is http://www.studyoverseas.com/
To find a school's catalogue online, try http://www.collegesource.org. This is a resource for which USC has a subscription. You can access it from a USC connection and from within CAS 120. Stop by if you have any problems and one of the Pre-Grad Advisors will help you. Among other information, the site offers catalogues in PDF format
For internationally competitive fellowships (Fulbright, Marshall, Rotary etc.).
To investigate the possibility that you may be eligible for a Stafford loan abroad go to "Grad Fully Enrolled" and click on "Stafford Program": http://www.iefc.com