In the latest Beta I noticed that Flash no longer got it's own taskbar window/icon, which is pretty inconvenient when watching a fullscreen Flash Video
Actually I'm not sure if it's reproducible on other browsers. So far there is no taskbar icon/window for any Flash-Window in Chrome v22.0.1207.1 dev-m (Dev-Channel).
Just tested this out and it's definitely something to do with the Chrome dev build. I noticed that it still has a separate taskbar button on the Windows taskbar, but it doesn't have the Flash icon any more, so there's something weird going on there indeed.