Got a couple of macro going, still experimenting my selfhere are a couple:
Nice AoE one:
#showtooltip
/castsequence reset=6/combat/shift Icy Touch, Obliterate, Plague Strike, Pestilence, Blood Boil, Death Coil, Death Strike, Death Coil, Death Strike, Death Strike, Death Coil
Death Coil with healing:
#showtooltip Death Coil
/cast [nomodifier] Death Coil; [modifier,target=pet] Death Coil
/cast [button:2, target=player] Death Coil
A good place to look is:
http://www.wowwiki.com/Useful_macros
got most of my macro's from there, just experiment a bit it's not as hard as it looks