Proc ability reminder addon?

[gitcho]

I was wondering if anyone knew of any semi- decent proc reminder addons out there?
Reason being, whenever I'm playing my Dk+ Pala team, I'm constantly forgetting to HOW with my pala's when the mobs/players get to below 20%. Obviously this a nice bit of burst that I'm completely missing out on due to the fact that I forget to use it every time!
I know Jamba has a nice proc warning feature, but as of yet I am unable to get it to work with HOW.

Any input would be much appreciated!

Cheers

MSBT. Great video here: http://www.youtube.com/watch?v=Fvt-cmKWWbY&hd=1