Since mid December 2009, AT&T has been testing the app and has recently notified Sling Media — as well as Apple — that the optimized app can run on its 3G network. The SlingPlayer Mobile app already is available for use today on AT&T’s Wi-Fi network, the nation’s largest with more than 20,000 hotspots.

I wonder by ‘optimized’ they mean that the video quality will look like that of YouTube over 3G. (i.e. poor)