Including at number 9:
‘Allow iTunes Store purchases via Wi-Fi’
The iPhone has 802.11 support, so it can connect to wireless networks. But as far as we know, you won’t be able to use the iPhone to connect to the iTunes Store and download music, movies, and podcasts. Sure, it might not work when you’re in EDGE mode on Cingular’s network (speeds aren’t fast enough), but if you’re on an 802.11 network using a high-speed connection, why not give the iPhone direct access to the iTunes Store?
Link: MacUser article