Arravis said:I'm stunned that no one has brought up the Aid Another rules in the Complete Adventurer...
wow.
We use them regularly. With a +5 BAB and using the Aid Another combat action, every 10 points you go over above the standard AC 10 grants another +1 bonus. It's on p96 of the Complete Adventurer.
I'm more stunned you didn't notice its post number 3 on the thread