I'm able to get a full day's use moderate use. Since moderate use can mean different things to different people, here's what I do:
Taking a few phone calls (20 - 30 minutes/day), using the web (about 30 - 60 minutes/day), auto syncing Google services, polling for other email once every 15 minutes, polling for Tweets, polling for Facebook updates. Bluetooth and Wifi on, GPS off.
At the end of the day, I usually have 20 - 30% battery life left.
I did condition the battery for the first 2 days (let the battery completely discharge then charge completely) but I'm not sure if that helped.
The battery life is on par with the Moto Droid and IPhone 3GS so I'm happy with it, but it's not shockingly better than the average smart phone....sorry, SuperPhone
