I've been playing with this mod a bit, though there are a few things I'd like to see added/modified to it, it's really kinda handy. It has click heal/dispell options, a rez monitor, buff monitor etc. You can custom color code player bars to turn a certain color when they are missing a particular buff, this also works with the debuffs. HealBot
Another really simple mod I found is VisualHeal
VisualHeal displays a single Heal Bar above the casting bar, which shows the health of the target, the incoming heal from others that will land before yours as well as the healing you are about to cast. It's extremely easy and fast to determine whether or not the heal is going to overheal.
Anyway.. just thought I'd pass these along