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Impressive Firefox extension helps you collect bibliographic & research information from sites like Amazon, Library websites, Journal sites, etc.  The ultimate bibliography building tool: you no longer need to copy all this out of books or off web pages ... Zotero can export/import BibTeX, RIS, Refer/BibIX, RDF, MODS, etc. and can even create APA, MLA, or Chicago style citations pages for import (as RTF) into your favorite rich text editor!

Imports bibliography data from an astonishing list of sites ( http://www.zotero.org/translators/ ) via RDF and microformats ( http://www.zotero.org/documentation/compatible_standards_and_software ).  It uses the mozStorage API (backed by a SQLite database), and it's all open source ( http://dev.zotero.org/docs/ ).