Let the hive mind of Engadget get that for you.
"I just switched to Sprint from Verizon about three months ago for the Pre. Then I went for the Hero about a week ago. Now, I miss my hardware keyboard and am thinking about switching to the Moment. I am still able to switch back to Verizon if I want and get the Droid when it arrives. Should I just trade up to the Moment when it comes out, see if I like it, and if not switch to the Droid? Or something else entirely? Help!"
Try using that application on an airplane or subway train or in an area of no data or wireless coverage. Then get back to me.
JA
Without network coverage, you wouldn't use safari anyway, much less the app manager. So it's still inherently useful when you know you have a network.
My point is that web applications cannot replace localized third-party applications because they are of no use without the network. The lack of third-party applications with a 4GB or 8GB flash is ridiculious.
I do like how the ModmyiPhone people were able to change the background. Once you can run homebrew apps on it, its not worth $600. Especially since I've made 3 applications which are very useful on my $50 Dash.
I personally would like Remote Desktoping on the iPhone since it has such a large screen but the web-only apps would leave you to depend on a web-based version which most of the time are not as good.
JA