Windows Vista makes many changes to the OS to improve the security and availability of the platform.  But any time the OS changes it can impact the compatibility of existing applications.

We have worked with our partners at the 05 PDC, TechEd 06 and in private labs to help get existing applications ready to run on Windows Vista.  From those labs we have assembled the content that developers need (PPTs, White Papers, Videos, Code samples, tools, etc.) to help ensure existing apps can run on the new OS.
 
We have posted this applications compatibility content on a new community site called http://DevReadiness.org 

Check it out and let me know what you think.

/bb