Thanks for using our forums. You have a great question. At this time, Chromecast will not currently work with the Slingbox. We do have a few connected devices that will work with the Slingbox however. The connected devices that will work are a WD TV, Netgear NeoTV, and Sony Internet Player with Google TV. These hook up to a remote TV via HDMI cable and connect to the router and you will be able to log in and view the app via the user interface. You can also use supported models of the apple TV and Roku devices if you have the Slingbox app on an iPad or iPhone for Apple TV and iPhone or Android phone for the Roku.
Hope this helps,
The Sling Moderation Team