Couple things to consider.
I'd prefer this kind of thing is downloadable and not have to go to a web-page to use. For example, as odd as it sounds, if I'm camping and we're gaming (which we do on occasion) I want to be able to use this on a laptop or smart device (android/iphone, ipad/tablet/kindle, etc) without having to have an internet connection.
I'd definitely pay $5.00 for a well made comprehensive combat app, maybe $10 if it does everything I want it to.
Those things would be to track...
Level
Hits
PP's
Bleeding
Stuns (of the various kinds)
OB (possibly broken down into it's parts)
- Natural OB
- Item bonuses (Magic or not)
- Magic bonuses (spells impacting the OB)
DB (possibly broken down into it's parts)
- Quickness
- Shield
- Magic
- Talents
- Adrenal Defense
...etc...
If you want to get really fancy; track in combat duration of spells cast on individual targets. Everything from Charm or Confusion to Auras and Hastes, etc, experience earned, etc.
Even without result look-ups this is a great way to track combatants status'.