I've got mine upto around 18 hours!!

• Moved the facebook widget off the homescreen
• Set brightness to level 3
• When at home on WiFi I switch off the cell and use tablet mode
• Switch off Bluetooth when not in use.
• At night in bed I use brightness 1
• I have an external GPS on bluetooth - more accurate and doesn't eat the phone battery.

I am using this a lot, playing with apps, downloading and updating things all the time, surfing, etc. etc.

Granted I'm not using the phone too much, but I do a lot of SMS.

Fully charged at 8am, it will be down to 20% by 10pm.

The facebook widget was the big battery killer for me.