RefWorks 3 is a Web-based bibliography and database manager that enables you to:
Organize your research
Import references from many electronic databases
Include citations while you write your paper
Build a bibliography according to different stylesheets (APA, MLA, etc.)
Create a bibliography in different document formats (Word, RTF, HTML, etc.)
More useful information on RefWorks, including how to create an account, is available here.
Zotero
Zotero is a free citation management softare. You can easiy add citations from databases, Amazon, Library catalog, etc. This Zotero Guide provides information on how to install, use, and much more.