Currently there is no easy way to override this without hacking the
core theme, but in app/includes/comments is this line:
<?php echo get_avatar( $comment, 32 ); ?>
Change the 32 to another value.
More Info: http://codex.wordpress.org/Using_Gravatars#Theme_Support_for_WordPress_2.5
- Eric Marden
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http://ericmarden.com