I would think that most people who preorder a new product, without even the opportunity to read reviews and handle it, is most likely inclined to like it. (Or be very disappointed).
I'm leaning more towards buying it now. I had been thinking that the battery life was a disappointment. But now that my iPhone is less than perfect, due to my dropping it, I'm thinking that the 3G one might be worth buying. I just wish I could get it before my upcoming trip, when I'll have some down time in a car.
I'm thinking 32GB model. Not the bottom model, but I'm not even sure I'll transfer my music to it anyway. I have it all on my phone now, and I take that with me anyway.