Ok first i know there are multiple threads saying task managers dont work, but let me be the first to say perhaps the Popular ones dont.. but i found one that does work good for the incredible.
I tried to use Advanced Task Killer from ReChild (didnt work for nothing), saw no difference in battery life. I tried a whole hosts of others.. nothing. Then I tried Advanced Task Cleaner Pro from Bright Wallace and i saw immediate BIG improvements. One of the most notable differences between this app and the others was the amount of listed running apps to ignore or kill that all the other task killers didnt pick up on.
I now have GPS on all the time, surf and do everything I use to and get maybe 40% better battry life. I suspect that the biggest issue with battery is int he Sense UI applications.. For the most part when i set those apps to auto kill thats when i began to see big improvements. So this gives me hope that a ROM update will improve this issue.