If you have never used Web of Science or Scopus, I would highly recommend using them for your research. Both Web of Science and Scopus cover all subject areas (Life Sciences, Health Sciences, Physical Sciences, and Social Sciences & Humanities) making them great choices if you are conducting research that falls across subject areas, like Psychiatry or Radiology. These databases also track the number of times an article has been cited and can calculate your h-index.
Scopus has a versatile search interface with good functionality, especially in refining or searching within the results. You can easily search by author or affiliation, and it includes indexing terms (MeSH and Emtree) in the citation information. There is overlap in journal titles indexed between Scopus and Web of Science, but Scopus includes approximately 8,400 unique journal titles as compared to Web of Science. (http://adat.crl.edu/)
Web of Science includes in its core collection the Science Citation Index, Social Sciences Citation Index and two Chemical indexes, amongst other resources. Through the Web of Science interface, you can also search Biosis and Journal Citation Reports, where you can find impact factors for journals.
If you have questions about either of these resources, contact your informationist!