i am sure as time goes on firmware and other updates will make the experience better, but for now you might have to deal with that. the choppiness might be related to the content on the webpage
I think it's important to remember that the G1 and more importantly Android is far from polished. I've already read some user reviews mentioning somewhat sluggish behaviour.
Like almightyA mentions, we should hopefully see some nice updates from Google as the open source community gets busy with the OS.
I'm with you on Flash too, i can't understand why it seems such an impossible task to get flash working on cellphones lol?