Hey Peter,
I notice that here:
http://candle.pha.pa.us/main/writings/pgsql/sgml/ddl-alter.html
You mention that you cannot remove a column. This is no longer true as of
last friday.
And here:
http://candle.pha.pa.us/main/writings/pgsql/sgml/ddl-depend.html
You say:
"All drop commands in PostgreSQL support specifying CASCADE. Of course"
Which isn't technically true for the ALTER TABLE/DROP NOT NULL statement..
Chris