Comcast rolled out a v1.5 update today for the iPhone / iPod Touch versions of its Xfinity TV app which allows them to access the video on-demand streaming that has been available on the iPad since February. Just like the iPad however, they'll only work over WiFi -- no streaming over 3G or downloading for offline viewing here, although unlike Cablevision and Time Warner's iPad apps, you don't have to be on your own WiFi for it to work. The slate of content has expanded to include 25 networks and over 6,000 hours of video, so for those confusing times when you're within
