Review articles give a bird's eye view of a field or niche within a field. They can contain valuable bibliography. The titles of these articles often have a slightly higher level or "generic" quality than the titles of articles reporting very specific research findings.
Some databases, e.g. Web of Science and PubMed, give you the ability to limit your search results to review literature.
Also, see the Annual Reviews box to the right. You can search across the annual reviews for a wide variety of subjects.