iPhone 4 on left, iPhone 3.x on right
iLounge has posted an excellent summary of changes in iPhone 4 on an app-by-app basis. They do a good job covering much of what has been discussed including multitasking, wallpapers, folders, mail and more.
iLounge, however, also noted that in iPhone 4's Safari application, Apple has removed the "Google" branding from the search button and simply...