The Chromecast seemingly has a lot more potential than as just a media streamer like Roku or Apple TV. As a salesperson who has experienced a heavy overnight travel schedule, this could be a nice tool to have.
Small and lightweight enough to travel easily (most have at least one or two thumb drives in their bag anyway), it can be taken anywhere. Most hotels now have HD TVs in rooms, and most clients have either flat screens or projectors with HDMI input in their conference rooms.
If you're already a heavy Google Apps user (I am), or even use MS Office on the web, a phone or internet connected tablet and Chromecast may be all you need for a great presentation.
While I've considered bringing my Roku on the road, for better entertainment options in the evenings, the size and simplicity of the Chromecast would appear to be a better solution, although the Roku currently has more channels, and combines with more types of TVs.
The screen mirroring of the Chrome browser could be very useful when a larger screen is needed for creating or viewing content, such as system drawings and diagrams, making any large screen a wirelessly connected monitor.
For this very attractive price, this thing should continue to sell like hotcakes. What do you think?