Editing WoW:Useful macros (section)

=== Multi-Purpose Party Healing ===
 #showtooltip <spellname>
 /cast [help] [@targettarget, help] [@focustarget, help] [@focus, help] [@player] <spellname>
* Use: Cast an healing/buff spell with limited need to change target. Is not useful for AoE spells as they often do not use a direct target.
* Note: Replace <spellname> with the name of the ability you want to cast. This includes the <>! And don't forget both places!
* Credit: Wu of Kael'thas
* Tested and working in 4.0.6

This macro works like the above, save the order of priority is switched a little (based on observed need). It can be used with a number of strategies, particularly when combined with the above macro. Priorities are as follows: If you are targeting a friendly, cast at them; if your target is targeting a friendly, cast at the friendly (useful for quick adds and bosses with random targeting); if your focus is targeting a friendly, cast at the friendly (useful for bosses); if your focus is friendly, cast at the focus; otherwise, cast at yourself.

Particular bonus when you are using the Multi-Purpose Attack Spell above, as it means you may keep the same person targeted for both healing and harming. You may also create awesome heal groups, for parties with weak AoE heals setting one person as the "main heal". These are just a couple of uses.