I can get about a day and a half before I get down to about 15% and need a recharge.
That's with WiFi mostly off , bluetooth always off , emails checked every hour , facebook for android always logged in , weather updated hourly ,GPS off . A few calls , 10-20 texts , little bit of web browsing via 3g/HSDPA/Edge.
I'm not really a heavy user of the phone and now that I've had it a couple of weeks I'm messing around with it less.
I also found that using Advanced App Killer made no difference.