I changed the frequency of checking e-mail and that seems to be a huge difference. I think I reduced it to once per hour. That should be plenty for my personal e-mail.
Yesterday the phone used less than 50% of the battery, although it was a relatively light usage day, however I did surf a few sites and played a few games of Bubble Breaker (strangely addicting).
I had originally set up all 3 of my mail accounts for 1 hour.
The web seems to be the battery eater. The phone even gets hot so I stay off the web as much as possible.
You got to love the weather screen, especially when it rains!