Yesterday I made use of a very simple, but very helpful app called "BetaHelper". It's a free app that you can have your beta testers install onto their iPhone or iPod Touch. It simply sends an email with the device's type, OS version, and most importantly, the UUID needed for AdHoc deployments.
I have no connection with this app other than I used it. It's really useful when the user won't be able to connect to their computer and use iTunes to get the UUID. Plus there is no need to copy and paste the code and manually send the email.