Search, cross-link references in PDF articles?

Perhaps this is just a fantasy, but is there any application or online tool that could search through the references of an article I have saved as a PDF, in order to check whether I have those cited articles in my larger PDF library? It would be perfect if it would highlight, link, or somehow display cross-referenced relationships between all my articles. I am already familiar with many referencing/PDF organization software such as Papers (Mekentosj), Sente, and Devonthink. I suppose what I have in mind is a similar tool, but with the additional power of something like ISI Indexes. I have a fairly large library (about 300 references that I'm actively using, and more than 2000 total) and I'm just trying to get some "big-picture" grasp of how all these sources relate to one another.
posted by samac on Jun 20, 2010 - 5 answers