I found one problem that was hindering battery life. I had the built in mail program configured to check my gmail account every 10 minutes. I found that even when the wifi and LCD were turned off, every 10 minutes the mail program would turn on the LCD and try to connect. It could not find a connection, would eventually time out, and screen would again go off. But every 10 minutes that process would repeat. It was enough to have a serious effect on battery life.
I ended up removing the email account and now just manually check my email through the browser.