As a side note, it would be really awesome to be able to specify
more descriptive spotlight queries, such as:
(kMDItemContentTypeTree = 'public.movie') && kMDItemLastUsedDate >=
$time.today(-7))
You might be able to do things like this: the query string uses the
same format as the one for the spotlight window and should accept the
same kind of operators. Look for Spotlight tips on the internet.