Just wanted to share how I squeeze the battery for more juice. I unplugged the charger at 11:30am yesterday and now at 1:15pm, I still have 30% left. In between, I read emails, watch 1 hour of mp4 movies, browse web for 30mins, accessed twitter, weibo and QQ. Video was played with moboPlayer and it set the screen at 75% brightness. Hopefully, I can conserve more juice by setting the brightness lower.
Most important is the display. Set the brightness to the lowest level comfortable for you. For me, I can live by with 5% brightness. Under the sun or bright lights, I set to 18%. I notice the brightness of the display doesn't change much between 1-17% but at 18% and above the screen becomes brighter. 5% might be too dim for many but at night while walking in the street or before bed time, its sufficiently bright.