Well over this Resurrection weekend I had the chance to start building the Psalm visualizer that I talked about several posts ago. The idea behind the visiualier is that it shows you by varying opacity the psalms that have NT references or allusions.
Right now the interface is very simple, but then again, it's just for me at the moment. The idea is that I insert a psalm reference and then a cross reference. In the dropdown I select "Direct", "Allusion" or "Pondering". Each of these has a different weight. The weights are then added up to calculate the opacity representation of each psalm. Feel free to take a look around.
My hope is that as I trek through the psalms I continue to add references to this site. When you click on the Psalm, it shows you the text of the psalm (thanks the the ESV web service) and the references I have marked in the margin. There are a lot of ideas for enhancing the UI that I would like to develop.. but all in due time.