Yeah, the battery is 1800 me thinks but it has a nifty task killer with it that limits what is being used etc. I can have wi-fi on constantly, my e-amils refreshed constantly, bluetooth on, screen at half brightness (full brightness is way too strong anyway) and a host of apps open and still get through comfortably into the next day.
I have the task-killer, but that battery life sounds massively superior to what I have. I basically turn everything off and I can get just about 6 or 7 hours of 2G browsing + IM Messaging (probably about 300-400 minutes talktime). In fairness that's comparable to the majority of Smartphones I've read about. Blackberry being the exception...and now yours.
Not sure whether you are in a strong signal area. I am in a terrible area and that seems to force mine to work much harder to get signal at any given time.
