Collect, Manage & Cite your Sources with Zotero
I recently learned about Zotero, free, easy-to-use Firefox extension to help you collect, manage, and cite your research sources, and I must say that I'm impressed. It is product of the Center for History and New Media at George Mason University.
Basically, you download a little extension for Firefox (sorry IE folks) and Zotero becomes embedded in your browser. Then whenever you come across a web page or citation you want to save, just click a small icon in Firefox's location bar (to the right of the URL) to save the citation and link in Zotero (see image). You can organize your sources into folders and subfolders. Add notes if you want.
Zotero works automatically with most online catalogs and a handful of databases, including a few law-related ones: HeinOnline, GPO's e-CFR, Supreme Court cases from Cornell's Legal Information Institute, and patents from the USPTO. And they are working on making it compatible with Westlaw and LexisNexis. For now, you can always manually add citations if no automatic translator is available.
Similar to EndNote or RefWorks, you can easily compile a bibliography with your citations in Zotero. Although it doesn't current support the Bluebook citation style, I've been told that they are working on it.
To learn more, check out the video tutorial.