Featured Image Size

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For post thumbnails you can either crop and image to the thumbnail size or scale the image.
To enable crop you can call the thumbnail 1 of 2 ways.

  1. Name a size in the functions.php file like so:

    <?php add_image_size( 'my-post-thumbnail', 494, 168, true ); ?>

and then call it in the theme file

    <?php the_post_thumbnail('my-post-thumbnail'); ?>

The true tells wordpress to crop the image rather than scale, to scale leave true out.

  1. Call the size just in the theme file

    <?php the_post_thumbnail(494, 168, true); ?>

Also, the_post_thumbnail doesn’t work on images already uploaded. To test if the sizes truly aren’t working upload a new file after adding the new thumbnail size/calling it in your theme file.

Mark on WordPress has a good tutorial on Post Thumbnails
http://markjaquith.wordpress.com/2009/12/23/new-in-wordpress-2-9-post-thumbnail-images/