This widget for SCOM 2012 developed by Microsoft employee Brian Wren can be very helpful in various cases. For example when you troubleshoot performance issues you can compare two or more computers in four different performance metrics.
Learn more about the widget, see screenshots and download it from Microsoft Gallery repository.
Code4ward provides for free a management pack for SCOM 2012 which allows you to configure a URL to a web page, which will be loaded and displayed in the dashboard widget. Works in Operations Console and Web Console (with limited functionality). You can find more about this management pack and download it from this link.