Re: 3GS battery life?

My 32GB 3GS does use the battery a tiny bit faster than my first generation iPhone, but the difference is negligible, and I use it a LOT.

A few things to try:

Check your backlight settings; if you turn it down a bit, it will make a significant difference in your battery life... whenever I'm running low on battery and nowhere near a charger, I kill the backlight to keep the phone going for a while.

Turn down your email check settings; it uses more battery when the phone checks for emails every 15 minutes.

Turn off Wi-Fi and Bluetooth if you're not using them... they're drawing power too.