There are a lot of settings that should be changed to maximize battery life. If you have your phone setup with facebook, Twitter, Flickr, etc., the default is to update that every hour. It is also set to update stocks every 15 minutes, update weather every 3 hours, and update news. That is a lot of background syncing and data download, I would recommend turning a lot of them off or raising the sync times.
I love how you can set peak and off-peak times for mail checking, I want my phone to check for mail every 30 minutes, but there is no point in it doing that while I'm asleep.