Player Usage Charts were first introduced in the 2011 off-season as OZQoC Charts after their two primary components: Offensive Zone Starts (OZ) on the horizontal axis and Quality of Competition (QoC) on their vertical axis.
Player Usage Charts were quickly adopted by dozens of statistical analysts (here's a list of the earliest adopters), and even some front offices, most of whom also made various improvements. Naturally the biggest improvement of all is the new name!
The largest contribution to Player Usage Charts was undoubtedly made by Eric T of Broad Street Hockey, who not only suggested the Corsi bubbles, but also created a new way of measuring the quality of one's competition: their average ice-time.
Attached are the Player Usage Charts for every NHL team in 2011-12, including expert analysis in the PDF, and the raw data so they can be sculpted as everyone desires (unfortunately the graphs in the spreadsheet will ONLY format correctly in Excel 2010, and will otherwise look like a mess).
Nov 2012: Also attached are the Player Usage Charts using Eric T's new way of measuring quality of competition (TOI). No analysis included in this version.