JANE-Journal/Author Name Estimator
JANE gives you a way to identify possible journals that have published on a specific topic. In addition to giving you a list of journals publishing on your topic, it will list the Article's Influence (based on Eigen Factor analysis).
Search by just the title or also include the abstract. JANE http://biosemantics.org/jane/ pulls its data from MEDLINE and gives you information on the 50 articles that are most similar to your article. JANE is a new(ish) tool from the Netherlands Bioinformatics Group, and provides
other finding tools like finding similar articles and authors who write on your topic. For more details, you check check out their FAQ page. http://biosemantics.org/jane/faq.php