In the true fashion of under-promise/over-deliver, my iPhone 4 arrived via FedEx a day before the official delivery date. Activation, via the AT&T site, was a snap. I’ve been using the phone now for less than 24 hours but here are my first impressions:

• FAST! I knew my iPhone 3G was slow, but I didn’t realize it was that slow. On the old phone, I’d pull up the iPod application and it could take as long as 20 seconds or so before it painted the first screen. The Flickr app was so slow as to be unusable except for days where I was feeling extra patient. Checking in to Foursquare was a chore. All of those worries are gone. The OS flips between applications without blinking or breaking a sweat. I feel productive again!
• PRETTY! The screen is gorgeous. There’s no other way to put it. You need to see it in person to understand. Text is crystal clear; you have to get really close to it to see any jaggedness. There have been some reports of yellow bands and spots on the new screens, but fortunately none for me.
• I am a little concerned about signal strength, as it seems like I’ve dropped one bar compared to the previous phone. Since I still have that phone I’ll have to do some side-by-side comparisons.
• The shape will take some getting used to. With the old phone, I kept it in my pocket all the time, and got used to determining the orientation of the phone by feeling for the smooth, curved back. With the new phone’s back being rounded off, it constantly feels like the phone is flipped around in my pocket so the screen is facing out. Just something I need to get used to, is all.

Otherwise, there’s not too much else to report that isn’t covered ad nauseum on tech sites and such.