Import from Tumblr to WordPress only if it has certain tag?

This is an untested hack, but it might work.

If you look in the tumblr_importer.php file, down around line 756, you’ll find this code:

$params = array(
	'offset'  => $start,
	'limit'   => $count,
	'api_key' => apply_filters( 'tumblr_importer_get_consumer_key', '' ),
);

This is defining what posts it should get from Tumblr.

In theory, if you were to add a tag to that array, like so:

$params = array(
	'offset'  => $start,
	'limit'   => $count,
	'api_key' => apply_filters( 'tumblr_importer_get_consumer_key', '' ),
	'tag'     => 'some-tag-here',
);

Then it would only fetch and import posts with that tag.

There are no plans to add this as a feature to the main importer, because the importer is actually intended to only be a one-time thing. Basically, it’s designed for people *moving* from Tumblr to WordPress, not for people posting things on Tumblr on a continuing basis. In such a case, you’d want to import everything, not just some things.