The additional images and differential diagnosis slides were particularly good and came from DermNet NZ.
There's also a good example of how the rash appears on darker skin at BMJ Case Reports1.
1. Tristano AG. A woman with muscles pain, weakness, and macular rash. BMJ Case Reports. 2009;2009(aug27 1):bcr0620092027-bcr0620092027. Available at: http://casereports.bmj.com/content/2009/bcr.06.2009.2027.full [Accessed May 6, 2010].