The readme needs to be updated for D6 & 7 since the l() function has changed and if someone were to put the D5 l() function into a D6 site, they're going to have serious problems.

For Drupal 5:
l('Provide feedback about our new frontpage', 'contact', NULL, 'category=Website feedback&subject=New frontpage feedback')

For Drupal 6 and 7:
l('Provide feedback about our new frontpage', 'contact', array('query' => 'category=Website feedback&subject=New frontpage feedback')