Ok, now that I've had mine an hour or so, some initial impressions:
1) size: smaller than I was expecting. Compared to buddy's iPhone 3G and the screen doesn't appear noticibly taller but the iPhone screen is noticibly wider. Nice heft to the phone, but not too heavy. Makes it feel nice and solid.
2) build quality: top notch. No creeks, squeaks, or anything other than rock solid, despite some attempts to induce some. Definite kudos
3) touchscreen: VERY responsive. Using my fingertips, I had no problems at all navigating the preferences menus (already scrolled through just about everything).
4) keyboard: not as bad as I was fearing from certain individuals' reports. There is a difference in tactile response from the top row versus the bottom row, but I get solid clicks out of just about every key as well as the haptic vibration and audible beep.
5) Phone usage: Called a couple people and hear them nice and loud. Sent two SMS and one picture message so far and was easy as pie. Going to love this.
6) Camera: took a couple quick stots of a friend and my daughter. Easy as pie. Able to do the half press/focus quite easily on my first attempt. Did a really short video, as well accidently. :embaresse
Haven't done more than novelty web browsing, etc but so far it's a blast.
More as I experience it.