CrossRef Forward Linking
In the latest review from Peter's Digital Reference Shelf Peter Jacso reviews SpringerLink and includes a very positive mention of how CrossRef Forward Linking has been used in the site:
"I am particularly pleased with the fact that SpringerLink makes good use of the ever-growing CrossRef database to find documents which cite the ones you are looking at...Once again, the list of cited references (not just the citedness score) is available not only for subscribers, but also for plain vanilla users - which deserves my awe. As I am writing this, CrossRef has 28.3 million Digital Object Identifier (DOI) links which has great potential for getting trustworthy citedness data instead of the often senseless, much deflated citedness scores dispensed by Google Scholar..."
The example article that shows Forward Linking in action on SpringerLink is from Scientometrics - doi:10.1007/BF02129596. Look at the right side of the screen under "Referenced By".
The review summary also mentions "the splendid PROLA archive of the American Physical Society" and how it uses CrossRef Forward Linking and says that "[SpringerLink] is an important example for other publishers that will also use CrossRef to offer search options based on cited and citing references."