I dont seem to have any problems with my battery and my battery usually lasts me a few days.

Then again, Ive had my iPhone for a long time and the novelty has worn off and barely using it unless im using the phone, lol.

Make sure u have ur auto lock on so your screen switches off. Also disable Push as mentioned above. There are also other little tricks like disabling 3g and reducing the brightness of your screen to conserve for a more efficient battery life.

I hope that helps
Kev