[sil3ntmac]

"Over 10% of our testers gave us the wrong number as their UDID."

It's not that hard. There's a free app you can put on your device that will email your UDID to where ever you want, or you can just copy it over from iTunes/XCode. I haven't ever had a client give me the wrong UDID (they have given me the same UDID twice though, forgetting that I already have that device in the database). The hardest part usually is that it can sometimes take 5-6 tries of dragging the app into iTunes (on Windows at least) for it to work. But even that isn't too big of a deal, just quick and easy repetitive motion (once they get the profile installed).

I think the biggest pain in the ass is on the developer's side. Anytime you want to run the app on another device, you have to add another UDID to the device list on Apple's site, regenerate your provisioning profile, download it, delete the old adhoc profile from ~/Library/MobileDevices (good luck trying to find out which of the profiles in there is your old adhoc, the files are named with a random string of letters and numbers), install it to XCode, open your project, and change your adhoc build profile settings to the new profile.

Phew.

[tienshiao]

You can manage your provisioning profiles more easily through XCode -> Window -> Organizer.

It'll list your profiles by name and expiration date. You can click on them to see more details, and also delete them from there. You'll stil need to update your project manually after you've swapped out the provisioning profile.