Just finished getting my gallery, which uses Flickr Gallery 0.7, configured on a fresh install of WordPress 1.5.1
Per anthonymcg’s post above I set my gallery.php in the root directory using the code he posted.
EXIF was set to false also & don’t forget to create flickr-cache folder in wp-content folder
Set it up as a page also by adding a template name to wp-content/themes/default/gallery.php
as such:
<?php
/*
Template Name: Gallery
*/
?>
The went to create pages from the admin panel and choose Gallery from the template choices.