8 Hours of talk was measured on the 1900MHz band with WiFi network scanning off.
6 Hours of internet browsing was done over WiFi or 1900MHz EDGE, on a closed network with dedicated web and mail server, simulating "browsing to 20 URLS and checking mail once an hour." (Hahahahah "Once an Hour"!)
Video playback life of 7 hours was measured by playing back a 2:23 hour long movie, which iLounge thinks is Pirates of the Carribean: Curse of the Black Pearl, over and over again.
24 Hours of Audio life was measured by playing 358 tracks over and over again, with content from both CDs and iTunes.