1) The document discusses various services for open access literature including institutional archives, metadata harvesting through Celestial, and citation analysis services like Citebase. 2) It describes how Citebase extracts references from texts and stores them in a structured database to enable citation linking and navigation between cited and citing articles. 3) Early download frequency data from arXiv.org is shown to correlate with longer-term citation frequency, indicating web impact may predict future citation impact.