My wife has iPhone 3G and I recently bought iPhone 4 for myself. Since we can easily manage charging for both of our phones from just one wall charger, I actually never unpackaged mine and data cable is still packed as well.
But few days ago I noticed that my phone refusing to sync with even older data cable (from 3rd gen iPod nano) although iPhone 3G does sync with it.
So that got me thinking, do I missing something by not using updated accessories? Faster charging time or data sync maybe? Any thoughts?