I thinking about stripping away some of the clunkiness in D20 to make it rules light for my Spycraft/D20 Modern game. For the defining mechanic is: set a Difficulty Class, Roll a D20 to beat it.
Current Heretic ideas
A. Getting rid of the Experience Point System. When I do a T.V. Show series Campaign that is a long runner like the A-Team (five seasons typically mean 100 episodes or more) it's quite possible that the Heroes will totally Max-Out around Episode 20 using the current system. Getting rid of the current Experience Point System and awarding Action Points (ala' Feng Shui) after every show seems like a viable solution. This means that the heroes gain a level after every 5 episodes, but they can use action points not just to modify rolls or get themselves out of a jam, they can also use them to improve their characters (again, Ala' Feng Shui).
B. Reduce Rules needing Miniatures. If you don't have miniatures, why use rules that require them?
C. Abolish Wound and Vitality Points and use Hit Points instead.
D. Level less D20?
This is possible. But it's far-easier to make something like Rolemaster level less than D20 level less. Rolemaster has a skill called body development that allows a character to develop hit points. With d20, you have to create at least four more skills: Combat (Improves BAB), Body Development (improves hit points and fortitude saves), Willpower Development (improves Will Saves), Reflex Development (improves Reflex saves).
That idea is really Heretical!
Current Heretic ideas

A. Getting rid of the Experience Point System. When I do a T.V. Show series Campaign that is a long runner like the A-Team (five seasons typically mean 100 episodes or more) it's quite possible that the Heroes will totally Max-Out around Episode 20 using the current system. Getting rid of the current Experience Point System and awarding Action Points (ala' Feng Shui) after every show seems like a viable solution. This means that the heroes gain a level after every 5 episodes, but they can use action points not just to modify rolls or get themselves out of a jam, they can also use them to improve their characters (again, Ala' Feng Shui).
B. Reduce Rules needing Miniatures. If you don't have miniatures, why use rules that require them?

C. Abolish Wound and Vitality Points and use Hit Points instead.
D. Level less D20?
This is possible. But it's far-easier to make something like Rolemaster level less than D20 level less. Rolemaster has a skill called body development that allows a character to develop hit points. With d20, you have to create at least four more skills: Combat (Improves BAB), Body Development (improves hit points and fortitude saves), Willpower Development (improves Will Saves), Reflex Development (improves Reflex saves).
That idea is really Heretical!