Hesitant upgrader from the 3G here.
The big thing that tipped me over was a feature that's flying under the radar -- voice command. Voice dialing should have been in the first phone, and I really feel this feature should have been added to older phones in the firmware, but adding in other things like iPod control won me over. Driving almost 3 hours a day this is a huge deal for me.
Other smaller factors -- more space (who can't use more space, my 16GB is full), I can use the boost in speed for SimplifyMedia, the video will be a cool feature, and I'm a budding iPhone developer so I'm adding it as a 2nd line to sidestep the prohibitive $499 price and I'll use my old phone exclusively for development.
The big thing that tipped me over was a feature that's flying under the radar -- voice command. Voice dialing should have been in the first phone, and I really feel this feature should have been added to older phones in the firmware, but adding in other things like iPod control won me over. Driving almost 3 hours a day this is a huge deal for me.
Other smaller factors -- more space (who can't use more space, my 16GB is full), I can use the boost in speed for SimplifyMedia, the video will be a cool feature, and I'm a budding iPhone developer so I'm adding it as a 2nd line to sidestep the prohibitive $499 price and I'll use my old phone exclusively for development.