What contextual links would make full-text journal articles more useful? After searching PubMed or Google Scholar researchers often arrive at a publisher's full-text article page. Assuming that you have access to the full-text access, what contextual links should be included within the article? i,e links to Brain Atlas, links to Gene Databases
This is a subjective question and what is useful would depend on from which domain of cognitive science the article originated. In general, I prefer when the PDF looks like the journal article (i.e., no formatting to indicate links). 

Here is a list of things that I find useful:


Links from in text citations to the location of the full reference
Links from references to the full-text resource
Links between Table and figure references with the actual figure
Table of contents tied to sections in the article
URLs and emails that can be clicked on
Tables with exportable data
If the article includes supplementary material, links to that material that work and do not require password access.


A few extra things that might be nice perhaps in the HTML version:


Ability to export both the article reference and the references in the  article in various bibliographic formats (e.g., bibtex, Endnote, etc.)
Page view, download, and citation statistics
RSS feed options for the journal