Re: PGAdmin Version 2.1

>Effectively, a composite type that can represent a row in a class

That may be true, but users expect to see "user defined types", not tables and views. As such, the query driving the display should be something like:

WITH types AS
( SELECT reltype
    FROM pg_class
WHERE relkind = 'c'
)
SELECT *
  FROM pg_type
 WHERE oid in (SELECT reltype
                 FROM types)
 ORDER BY typname;

No need to duplicate everything else.