A couple IE9 MSDN resources, The Internet Explorer 9 Compatibility Cookbook and Internet Explorer 9 Samples and Tutorials
"A lot of developers ask if the application they developed runs well on IE8 and below, will the application still work fine on IE9. Very good question! I always have some problem to answer the questions well, now I have some good news to share.
The Internet Explorer 9 Compatibility Cookbook is available now. ..."
- Features Changed in Internet Explorer 9
- Features Deprecated in Internet Explorer 9
- Application Development Guidelines and Tools for Internet Explorer 9
The Internet Explorer 9 Compatibility Cookbook is designed to help you understand changes in Windows Internet Explorer 9 that might impact applications that you developed for earlier versions of Windows Internet Explorer. Many changes help Internet Explorer comply with broader industry standards, and other changes improve performance and reliability.
The Internet Explorer 9 Compatibility Cookbook includes information about changes to features, identifies features that are deprecated or removed, and describes general tools and guidance. New topics will be added to this section as features are modified and as you identify areas where you need more information.
The Internet Explorer 9 Compatibility Cookbook is intended for anyone who develops or maintains Internet Explorer applications.
Which then led me to this...
- Debugging and Troubleshooting Your Webpage
- Enabling Standards Support
- HTML5 Audio and Video
- HTML5 Graphics
- Pinned Sites
This documentation provides sample applications that are built with features of Windows Internet Explorer 9, modern standards, and real-world design. Each section presents one or more developer scenarios followed by a number of tasks. Each task is designed to help you understand how to achieve the specified goal.
I've not blogged about IE9 much, so when this caught my eye...