I'd really like to upgrade to iPhone 3gs. I read an extensive technical review at Anandtech.com which states that the new phone is really quite faster in processing apps and downloading pages because it uses a faster multithreading processor. The article lists actual benchmarks.
Price is holding me back right now. I can afford it, but AT&T won't discount the price until I have many more months of current contract complete.
I hate the idea of paying more especially when my reception and coverage leaves much to be desired.
But 3gs may be better for accessing AC.