I just upgraded postgres from 7.1.x to 7.2.x

I was foolish enough to use the = operator to call
NULL value records from the database, ie:

select genre from genres where parent = NULL;

This no longer works, the operator must now be IS,
and this now works.

Has anyone else found this, and are there any other
common pitfalls i might walk into that someone else
has encountered?

Flawless