I found this macro at Wowwiki.com, it's for an Unholy DPS rotation:
#showtooltip
/castsequence reset=6/combat/shift Icy Touch, Plague Strike, Scourge Strike, Pestilence, Blood Boil, Death Coil, Scourge Strike, Death Coil, Scourge Strike, Scourge Strike, Death Coil
When I try and use it, it seems to only get up to the first ability or two, and then go back to my auto attack
Is there something I'm missing here?