How would I invite, say, my boss and his bosses, to demo an application before I publish it?  Or our QA department to run through the application before I publish it?  We do not want it live during 'testing'.

I tried to access the application from a non-developer myspace account and when I try to add the application, it gives me an error saying I do not have permission to install this application.

Perhaps this is a feature request? 

Short of giving out my email address and password for my personal account to the entire QA team, including my boss and bosses, so they all can login and test it; what am I to do?

Sign in to MySpace as your App (using the email address and password you set when you created the App), then navigate to the profile(s) of the user(s) you'd like to test your App. Add them as Friends. Once they sign in and approve your App's friend request, they can go to the App's profile and add your App to their accounts.

You can dev-test up to 20 installations this way.

Very nice.  I vote this as a sticky or FAQs insertion.   

Jeremy:

Sign in to MySpace as your App (using the email address and password you set when you created the App), then navigate to the profile(s) of the user(s) you'd like to test your App. Add them as Friends. Once they sign in and approve your App's friend request, they can go to the App's profile and add your App to their accounts.

You can dev-test up to 20 installations this way.

thankx jeremy. if i known it earlier. i had to give my account's password to my boss.