The official battery life (iPhone 4) is 300 hours Standby, or 7 hours talk on 3G (14 on 2G), or 6 hours Internet on 3G.

Yes well my X10 apparently has a standby of 415 hours but I know that's crap.
2 days, if possible, is still pretty crap compared to older phones.
But if you get a smartphone you have to recalibrate your expectations.

I turn mine off overnight, and with my obsessive e-mail / facebook checking etc I normally get 2 or 3 days before I have to charge it.

The only time battery life has been a problem is when I go camping, but even then it doesn't bother me that much. I just leave it turned off most of the time as I have better things to do when I'm out and about anyway 😛

The only time battery life has been a problem is when I go camping

Car charger if you are near your car. Otherwise one of those Kensington spare batteries is really useful. Or even go for a solar charger.

I take the charger to the pub. 😆

i got one of these, i'm open to offers for it, as now i have the iPhone 4 it doesn't fit.