A bookmarking service, that not only saves any "interesting" links that you visit but also saves the data in that link for future search. The service should let you specify topics that you are interested in and will analyze every page you visit (with the exception of blacklisted pages) and put it into the appropriate bucket (topic), for future reference. It should also index the PDFs and word documents that are read by you. In research we consume so much of content. Organizing them effectively becomes as daunting as the research itself at times.