ShadowRotation is a small TBC AddOn made to help Shadow Priests adapt their PvE rotation with a few information (CDs, DoT duration on current target, Mind Flay ticks).
You can find more information on the following EJ thread: http://web.archive.org/web/20080913120445/http://elitistjerks.com/f31/t16977-shadow_priest_101_how_melt_faces_effectively/
- Download it
- Extract it under 'Your_WoW_Directory\Interface\AddOns\'
- Remove the "-master" from the folder name