Use Google Scholar to search for literature or to follow up with cited reference searching to find related papers. Be sure to keep an eye on what you're finding - it offers access to a wide range of articles, not all of which are peer reviewed.
JSTOR has a robust full text archive, but it does not offer access to the most recent literature...articles are at least 3-5 years old before they are available in JSTOR.
A multidisciplinary database containing full text journal, magazine & newspaper articles, many from peer-reviewed titles. This scholarly collection covers information in nearly every area of academic study.