Bing Webmaster Tools has a new tool called the Markup Validation Tool, which can be found under the "crawl" tab
"This tool is a great way to understand if the added code is actually going to be readable, as intended," says Bing's Duane Forrester. "While the markup code being inaccurate will not cause your page to render any differently in most cases, having the syntax incorrect can affect our ability to use the data as you intend. Now you can easily check URLs for valid markup code from inside your webmaster tools account."
The tool scans: HTML Microdata, Microformats, RDFa, Schema.org, and Open Graph markups, and displays them when properly implemented. When the user enters a URL, it will scan it and show the data it finds.
If a page is scanned, and doesn't have any markup installed, or if it's not installed right, the user will get an error message.
"If you are experiencing errors when using the tool to check your markup installation, please reference the links provided above to ensure you are using the code as intended within the parameters specified for each language," says Forrester.
In other Bing news, it sounds like they're preparing to do something more useful with all of that Facebook and Twitter data they have access to.