Add-on for spellstealing?

whats a good addon for knowing if a mob can have a successful spell stolen?
thanks

Spellstealer, you can find it at curse . c o m.
Also, part of mage nuggets.
you can also set up xpearl to show spellstealable buffs extra large on targets
I have used spellstealer and loved it. It made me start thinking about all of the things I could dispel on enemy targets when I was healing on my priest instead of playing my mage.

Spellstealer appeared to be for mages only, so I switched to DispelWatch which works for all classes. If you can't find DispelWatch on Curse, I think it is on WoW Interface.
I just look at their buffs for one that has a thicker border around it. This means it can be stolen.
I use Mage Nuggets and it works quite well.
if by "mob," you mean "alliance priest," then the addon is "spam spellsteal until you steal their power word: shield." The addon makes a pretty chord sound and you get a yellow bubble.