WindowWatcher is a free hybrid window magnifier and remote control spy. It gives Windows the ability to have proper and resizable picture-in-picture support above and beyond Aero Snap. It's great for watching stuff like online TV, streams or Youtube playlists in a small corner of your workspace while working in the rest of it. It's also a fantastic help for tasks that would otherwise require flicking back and forth between windows, or to provide a simple pop-out viewer for websites and apps that don't have their own.