[ma2rten]

It looks professional.

[cartoonfoxes]

And it has the practical value of informing you than someone maintaining the site has at least looked at it within the last year or so.

[seandougall]

Or had the forethought ten years ago to add:

&copy; <?php echo strftime('%Y'); ?>

;-)

[damoncali]

You're supposed to put the year the material was copyrighted, not the current year.