http://www.macworld.com/article/132404/2008/03/sdkthoughts.html
There will be an app on the iphone itself like the itunes store – that’s the primary distrubution channel. You can download through itunes on the desktop but it is secondary.
VOIP
AIM client
Exchange and ActiveSync
EA games and some other big developer i forgot
Free and pay-for software
Download and install on the go