Chrome: Chrome makes it easy to stream YouTube videos to your Chromecast, but if you're watching a video on another site, that's a bit trickier. VidCast adds a bookmarklet to Chrome that lets you cast videos from the current browser window.
Casting web video is nothing new, of course. You could cast the page featuring the video, but that includes the ads and extra stuff on the page. VidCast casts just the video to your screen.
VidCast does this without installing any extensions beyond the normal Google Cast extension. After you find a web page with a video, click the VidCast bookmarklet and press play. The service will show a brief ad for dabble.me on your Chromecast while the video loads.