Yesterday, AT&T responded to press questions about this by sending a P.R. email.

“AT&T does not manage or approve applications for the App Store. We have received the letter and will, of course, respond to it.”

You betcha. The problem is that AT&T already publicly copped to keeping the Slingbox software off the Apple iPhone, while letting other bandwidth eaters like YouTube and MLB At Bat live video run without interference. And of course the Google Voice app and the Slingbox app are running fine on BlackBerry phones on the AT&T network. Slingbox is also running on Windows Mobile Smartphones. In conversations with one of the Slingbox developers, I was told Apple was fine with the app until AT&T got involved.