HBO go is a mobile service from HBO. If you subscribe to HBO you can watch HBO Go and any smartphone, tablet or xbox 360. You just need to download the app. Please note that it does not work on google tv or roku.
It is ridiculous that Comcast does not allow roku streaming of HBOGO. Just went to the effort of buying a Roku after my blueray player streaming malfunctioned and was looking forward to watching HBOGO without running a cable to another device. Thanks a lot Big Brother for choosing to handicap your service. With what this company charges just for high speed internet, this behavior is ridiculous. Why does this company seem to delight in making my life slightly more difficult. Between the deceptive advertising practices and issues like this, I would vote for any politician that proposes breaking this monopoly.