template.php not running phptemplate_preprocess_node

I've found that after creating some custom nodetype template files, that I need to call the block function from the custom node.tpl.php file (node-trail_review.tpl.php). Unfortunately, it looks like the preprocess_node function isn't actually loading when I view the node. I can verify this with the "DEBUG" line, which doens't output anything to the test file...

Here is the template.php file:

function phptemplate_preprocess_node(&$vars) {
        $vars['nodephoto_block'] = theme('blocks', 'nodephoto_block');
        $vars['google1_block'] = theme('blocks', 'google1_block');
        $vars['test'] = 'TESTSTRING';
        // file_put_contents('/tmp/vars.txt',$vars); // DEBUG
}

My node-trail_review.php has echo statements for $nodephoto_block and $test, but neither show up...

Am I missing something here?