iOS 4: wireless app distribution for in-house applications [closed]
If you don't have an entreprise account. You won't have the unlimited or very large pool of devices you can add to your account distribution profiles. BUT, even with normal accounts you can definitely create an Ad Hoc distribution profile (limited to 100 devices) and use the Xcode 3.2.3 "Build and archive" + "Share app / Distribute for entreprise" feature. This will create a .IPA app bundle that already contains the distribution profile. All you need to do is create a web page on some server containing a link with some special scheme.
For instance:
<a href="itms-services://?action=download-manifest&url=http://www.myserver.com/ota/myapp/appname.plist">Install My App over the air</a>
Found a guide on how to get wireless app distribution working. You do not need to be part of the enterprise program for this to work.
http://jeffreysambells.com/posts/2010/06/22/ios-wireless-app-distribution/
The official documentation is no longer tagged as pre-release (and no longer requires a dev login):
http://help.apple.com/iosdeployment-apps/#app43ad871e