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Check out ‘AdHoc Distribution’ in the Apple Developer portal. What you do is add your boss’ iPhone to your list of Devices and create a special AdHoc certificate. Then build your app using this cert and drag the app and cert into your boss’ copy of iTunes and sync.
You can send him the published xCode project.
Adhoc distribution is another solution but if he knows how to click build and run in xCode and the bundle identifier is setup to a provisioning profile he can use then thats probably simpler.
I feel sure that iTunes would cope with a drag and drop, but for safety you might want to get the boss to show the Applications part of his library, then drag the two files into that window. Then select the iPhone, and just sync applications.
Hey Anton!!!
Welcome to the dark side 
You will find Unity much more enjoyable than where we came from!
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Adding his device ID to the provisioning profile is the magic. Once you’ve built the app with the new profile, you can just give your boss both the app and the profile, and he can just drag them onto the iTunes icon.
has anyone tried this? I added a friends iPhone to my provisioning profile, built the app with the new profile, sent him both the profile and the app and when he tries to install it he gets an error…
couldn’t validate application or something like that.
am I missing something?
This happened to us – restarting the iPod once the new provisioning profile is synced fixed it (press and hold the power button for 5 secs then ‘slide to power off’, and restart).
it worked in the end! disconnecting and powering off helped.