This repository has front end code for the related items widget. The widget can be run as a user script.
This user script should work on FireFox with Greasmonkey or scriptish
Safari < 5.1 with SIMple Bundle Loader and Greasekit
Safari = 5.1 with NinjaKit
Chromium and Google_Chrome (version 4 and higher) have built-in support for Greasemonkey-style user scripts.
Inserted into target page. This will a) find the URL for the Collection b) look that URL up in rexster and c) then it will only show the icon if there are related items.
This sketches out what will happen if related items are found http://www.screenr.com/Fz3s