The best thing which is part of the new iphone is the new software and the App store
This means that even existing iPhone owners who have upgrade to the new version of the software can now install both free and paid apps on the phone .. facebook , google , myspace , ebay all have native iphone apps out there this means that browser based applications on the phone are not going to much popular anymore ..
native apps mean more power , features and also ease of use
if you are a developer .. you might consider downloading the iphone sdk and develop apps for the same
we are working on iphone application list for you folks !!