Update via engadget:
"AT&T certainly made a few of us happy yesterday when it announced that the iPhone SlingPlayer appwould now be allowed to run over its 3G network, but the carrier apparently embellished the facts a little when it said Sling had optimized the app to be "more bandwidth sensitive" -- Sling's John Santoro told Ars Technica that it "didn't change anything," and that "AT&T never discussed specific requirements with us." So much for that happy narrative -- we thought AT&T's line sounded odd, given that SlingPlayer has always run just fine on AT&T Windows Mobile, BlackBerry, and S60 devices. It's cool, though, Sling isn't sweating it: "Whatever the reason, we're just glad AT&T has approved it." Now it's just up to Apple to let it through the App Store -- any day now, guys."