CINAHL, The Cumulative Index to Nursing and Allied Health Literature, is cross-searching approximately 3000 journals, including: American Journal of Nursing; MEDSURG Nursing; Journal of Nursing Administration; Nursing Research; Journal of Nursing Education; and many, many, more. Dissertations can also be found in CINAHL.
This is the largest biomedical database, made freely available by the National Library of Medicine (NLM), that is cross-searching approximately 5000 journals, and specifically contains a Journal Category of Nursing Journals so you can focus your search if you are specifically wanting to find articles written by nurses (nurses are most likely to publish in nursing journals).
STAT!Ref = Immediately (STAT) available Reference Books (Ref). This collection of medical e-books includes a significant amount of nursing-specific information, and is a great place to get overviews of conditions and procedures.
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This HUGE database is actually cross-searching the very large databases Academic Onefile and General Onefile, as well as other Gale databases, so it is a great place to look when you have a challenging topic to research.