For years, I've been looking for a serious online research tool that would let me not just add to the ratnest of bookmarks and favorites I have, but really control, annotate, correlate, tag and source online material. Last week, as I was gearing up to join WWD, I found an awesomely deep, free, open source and innovative tool in the form of a super-stable FireFox 2.0 extension: Zotero.