Why Does My iPhone 3GS with iOS 4.0.1 Cause Rapid Battery Drain

I upgraded my iPhone 3GS to iOS 4.0.1, and now the battery drains very rapidly---needs to be recharged after a few hours---and gets very warm. Before this, iOS 4.0 was fine (although slightly increased battery drain over 3.1.3).
I use Exchange with push and had no issues before iOS 4.0.1. This may be the culprit now because when I turn off "push," the battery drain appears to be normal (although not extensively tested yet). But, I also have MobileMe, Yahoo!, and Google email accounts set up.
Is this a new problem? Anyone else have this problem? How can this be fixed? Anyone have any ideas?

*Reposting this..had done the same thing earlier as well*
This is my observation from past 6 nights;
All 6 nights, charged my iPhone to max and then kept it in sleep/stand by. Not even a single call or mail checked...(11 pm to 6:30 am when my alarm rings)
1st & 2nd Nights, I had flight center, angry birds, twitter, facebook, mail, phone, sms, settings app open in the multi-tasking bar.
Battery drained from 100% to 83%
3rd and 4th nights, i had only twitter, facebook, mail, phone, sms
Battery drained from 100% to 92%
5th and 6th nights, I had nothing open
Battery drained from 100% to 93%
my mail is always in push enable setting to exchange and me account,
location always on, bluetooth always off. 3G off
I thought, the applications on multi tasking bar is actually not draining the battery, but looks like they are...might be a flaw in multi tasking api or may be from developer.
I hope to get an easy way to kill the apps and not let it go to multi tasking bar.

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