With all the topics on balance I'll stick with UI for now:

* Party frame: Highlight health bars with an estimate of how much HP the currently active HoTs will restore (perhaps best if it assumes no crits).
* Party frame: Grey out party members when they're out of heal range, or optionally when they're out of medica/helios/indom range.
* Maybe a telegraph of Cure 3's range. A la astral star.
* TELL ME WHO THE OTHER HEALER'S RES TARGET IS EVEN IF THEY UNTARGETED/TARGETED SOMEONE ELSE DURING THE CAST. Cough.