In reply to gethin_allen:
Similar here - if I have it running huge downloads, using web-based apps, using GPS and making lots of calls I can just about get it down under 10% by bedtime.
Normal use (1-2 hours of music, 30 mins or so of web browsing, a couple of calls), it will be at 40-60% at the end of the day.
Fairly impressed.
It also has staggered power management, so you can step down its use in two phases if you know you will be a while between charges.