Oh yes. Give me what you just described, integrated into a typesetting system that can produce scientific papers of LaTex quality (or, simply, a LaTex editor like Kile) and make citations to those sidebar infos drag & droppable, with links to the fulltext PDF (might need integrated Login handling for the electronic publishers).

Second idea: Scratch that and integrate it into a PDF reader instead and instead of drag & drop give me the citations as plaintext popups (this way it would be useful for other purposes, even book reading).