Thank you for all the useful replies!

I'm hoping to have an enemy list similar to my vuhdo/healbot/whatever list. Just as I can right click on a friends bar and have all healers cast renew or whatever, I'd like to have a similar dynamic list of enemies where if I click on the bar it will attempt to cast corruption.

I'll take a look at the addons mentioned above and see if any of them do anything close I understand that it won't be able to sort the list according to who is closest, but it would be nice if it showed only enemies in range of a particular spell and the list was in the same order/position on every toon.