(work in progress)
This is to some extent based on a post that was necessary in the earlier SharePoint forums.
Here's a list of topic areas that have no place in the SharePoint 2010 forums
1. Questions on earlier SharePoint versions (STS; SPS 2001; WSS 2.0; SPS 2003; WSS 3.0; MOSS 2007).
These continue to go to the original SharePoint forums here:
2. Questions on Project Server 2010.
There is now (November 2009) a Project Server 2010 forum here
In time additional Project Server 2010 forums may be added in which case they will be listed here