Cocoa App: How distribute beta versions?

Question

Until today I've developed and tested by myself all the versions of my app! I would like to begin to release some versions for beta tester, to have a better product to release! But I really don't know how do that!

I had thought to upload the beta version on my website in a password protected folder and sent to my testers a notification (by e-mail) about the availability of a new beta version.

Or to upload the beta version on a restricted area of my website and mail to my tester a dynamic link (with an expiration time) to the new available beta.

These are some good way or I can do that better?

Thanks in advance for your replies!

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EDIT

I already have some beta tester, I'm not searching for new one! I'm asking only for a suggestion on how send my beta version to my tester!

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EDIT 2

The app I want to send to my testers is a MAC OS X application, not an iPhone OS app! Otherwise, I would like to distribute the app (only to my beta testers) in a secure way ... so I can't use software updates frameworks as Sparkle!

Answer 1

If you are sending it to other developers (who have their own device deployment identifier) then you can send them the binary, and they'll be able to install it onto their own iPhones. However, if you want to send it to end users who have iPhones then you'll have to get their device ID and register it as a device on your account, and then provide a per-binary signed for each one of their devices.

They'll then be able to take the app, put it in iTunes, and then it will be sync'd across to their iPhone.