NCBI has created PubMed Labs as a place to test new innovative features in PubMed and NCBI. One new feature is PubMed Also-Viewed. Much like Amazon’s “Customers Who Bought This Item Also Bought,” this feature uses anonymous user data to identify publications that are viewed together by the same user. It can be found for some articles under the Related Information section on the right-hand side of the page. For now, this will be in effect for a small sub-set of articles as it has only been using data from the last year, so older articles will be especially underrepresented.
Let NCBI know what you think by commenting on their blog posts about new features at NCBI blog.