NOT IN Optimization

Fellow PostgreSQLers.

Today I found that I need a NOT IN subquery for the first time. It
looks like this:

SELECT r.id, r.parent_id, r.path, r.uri, r.size, r.mod_time
FROM resource r, media_type t
WHERE r.media_type__id = t.id
AND r.id NOT IN
(SELECT resource__id
FROM job__resource
WHERE job__id = 1027)
ORDER BY path

Now, I know that this has been optimized in 7.4, which is great, but I
still need to support users of 7.1 and later. So I'd like to optimize
this. I've gotten used to changinb IN queries to inner joins, but that
doesn't work for NOT IN, of course. Am I missing something, or is this
as optimal as it gets?

TIA,

David

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