I was doing some checking and there are some really cool virtual labs on IE 8 that just went live check them out here.  The top 7 labs in the list are developer focused but cool to walk through.  The last two talk about application compatibility and enterprise support for accelerators from a IT Pro perspective.  Enjoy!:

Building Web Slices with Internet Explorer 8

Preparing for Internet Explorer 8- Application Compatibility

Using Accelerators and Web Slices in the Enterprise with Internet Explorer 8

Creating Accelerators In Internet Explorer 8

Internet Explorer 8 - Debugging and Application Compatibility

Internet Explorer 8 Improved Programmability

Using New AJAX Enhanced Layout Standards Support with Internet Explorer 8

Preparing for Internet Explorer 8- Application Compatibility

Using Accelerators and Web Slices in the Enterprise with Internet Explorer 8