After fielding many requests for AIF documentation for both 4.0 and 2009, I put together this handy-dandy reference guide for the AIF documentation. It lists the documentation resources for both versions.
When it comes to AIF, there are things that end-users, administrators and developers each need to know. This makes it a unique feature documentation-wise because we have help content for different audiences in different places.
Hope you find it useful. I'll be posting any future updates here as well.