After 3.0 all mobs health is shown as numbers which in most cases is a good thing, however being a mage (and I'd guess for some other classes as well) it's important to know the percentage the boss is on (eg. Molten Fury at 35%) not to mention various phase changes dependant on percentage.

Is there any addon/way to show an indicator when a mob reaches a specified percentage and still show health as a number?

Thanks.

ag_unitframes allows you to decide what is shown. At present I have it setup to show both the numbers and the %.

Pitbull also allows you to turn both % and absolute health/mana on.

I believe what you are looking for is a unit frame mod.

MobInfo2 also showed both hp and hp% however it's outdated at the moment so no help from there.
I'm looking for a same kind of addon and I wonder is there some simple addon for this if one doesn't want whole unitframe addon like pitbull...

MI2 is updated-just check wowinterface
X-perl can give you health and % as well