A little experiment with D3.js to view my iTunes library XML file. The size of the bubble corresponds to the number of times I listened to the track. The color represents the rating I gave it (number of stars). If you click on an entry, it will try to find the song in YouTube. I also built an album art scraper in Node.js, but it's not running any longer — sorry!
Try it out here - desktop only
(it's a snapshot of my listening habits frozen in time from 2011)