Great guide! In addition to what you listed, here are a few other things you can do to squeeze out more battery:

Disable the vibration feedback for the screen
Like disabling vibration for IM notifications, if the vibration motor is triggered with every finger press, that's going to drain battery

Turn wifi down to 10mW if you can
If you go to the advanced settings for your wireless connections one of the tabs allows you to change the power output of the wireless card (this has been mentioned in other threads here). Change 100mW to 10mW. In my experience I can still use wireless throughout the house on 10mW without a problem.