Although Steve Jobs said it was rude to post ‘intimate’ emails with customers, this one could use some spreading.  For those who are stuck with an iPhone 3G running iOS, there is some good news:

The new email came in response to feedback sent by a customer who expressed frustration over the performance of his iPhone 3G, calling it "dog slow" and pointing to problems with system responsiveness when scrolling, zooming, and typing.

I’ve waited patiently through 4.0.1 and 4.0.2, looking for a fix that will make my phone work again. I’ve read the forums that advise me to jailbreak my phone or use some other method so I can downgrade back to a version of iPhone 3, however I’m not prepared to use a method that is not supported by Apple.

Jobs’ response was unsurprisingly terse:

Software update coming soon.
Sent from my iPhone

iOS 4.1 Betas on iPhone 3G devices have shown steady speed improvements, though there are limitations with older hardware.  Apple was selling the iPhone 3G up until a few months ago ($99 option) so getting a fix in place is important.