I\'m a first time iPhone application developer and I\'m developing application for my client who wish to distribute this application to a group of people related to his business
One way around this is to submit your application to the App Store, but put it's availability date in the future.
Then, you can create promo codes and send them to the people you'd like to be able to download your application, but it won't show up in the store.
If you do it this way, you don't need to know anybody's UDID, but you're limited to 50 people per version of your application.