iPhone Ad Hoc Distribution

I was going to post a guide to do this, but Craig Hockenberry already did.  You can find his post here.  I will add to this though, that it is easier to create a PayLoad folder, drop your app bundle into it, and then zip up the PayLoad folder.  Rename it to your app name with a .ipa extension.  For example, LightBikes.ipa.  Then your users can just drag and drop your ipa file to iTunes and Sync.  This will work for both Windows and Mac users.