Most literature databases offer the option to limit to review articles, or you can search for "literature review", "systematic review," "meta-ethnography" etc., plus your search terms, in the article title. To search within titles in PubMed, go to Advanced Search.
You can browse recent issues of medical education journals for review articles. McGill University offers a list of med ed journals here. To access the UofC subscriptions, search the journal titles on the library web site.
Best Evidence Medical Education (BEME) has a list of published reviews and reviews in progress.
