In this bboard post, Peter Vissenes of Ybos mentions they have added a column to the site map which lists the package type next to the name. They also added wizard support to the site map. Their work seems to have been done for Oracle.

Because I found the lack of this extra column confusing also, I ported the code for the additional column to PostgreSQL and can make a patch available for inclusion in OpenACS if there is interest.

I have not done any work to port the wizards stuff.