The content query webpart is a very powerful tool when constructing complex SharePoint structures. I will try to make a posting on how to use it in an effective way using custom content types, later. As for now, please read the following article concerning how to display other columns in the webpart than the standard ones:

http://msdn2.microsoft.com/en-us/library/ms497457.aspx

Here is another blog posting concerning the same theme:
http://www.microsoft.com/belux/msdn/nl/community/columns/stevenvandecraen/contentquerywebpart.mspx

Gustaf Westerlund
CRM and SharePoint Consultant

Humandata AB
www.humandata.se