Maybe these new FREE Hands on Labs will help. Let me know if they do. Also my colleague, Mithun Dhar, has been blogging about IE8 for developers.
MSDN Virtual Lab: Building Web Slices with Internet Explorer 8
Developer
http://go.microsoft.com/?linkid=9655888
MSDN Virtual Lab: Preparing for Internet Explorer 8- Application Compatibility
http://go.microsoft.com/?linkid=9655889
MSDN Virtual Lab: Using Accelerators and Web Slices in the Enterprise with Internet Explorer 8
http://go.microsoft.com/?linkid=9655890
MSDN Virtual Lab Creating Accelerators In Internet Explorer 8
http://go.microsoft.com/?linkid=9655406
MSDN Virtual Lab Internet Explorer 8 - Debugging and Application Compatibility
http://go.microsoft.com/?linkid=9655407
MSDN Virtual Lab Internet Explorer 8 Improved Programmability
http://go.microsoft.com/?linkid=9655408
MSDN Virtual Lab Using New AJAX Enhanced Layout Standards Support with Internet Explorer 8
http://go.microsoft.com/?linkid=9655409
TechNet Virtual Lab: Preparing for Internet Explorer 8- Application Compatibility
IT Pro
http://go.microsoft.com/?linkid=9655908
TechNet Virtual Lab: Using Accelerators and Web Slices in the Enterprise with Internet Explorer 8
http://go.microsoft.com/?linkid=9655909