Here's what I'm using right now:
' (UID#<?php $user = get_userdata($comment->user_id); echo $user->ID; '?>)
but that code is slowing my site down a bit. is there a smarter way to show the user ids in the comments?
here's an example of what I'm doing:
http://www.myconfinedspace.com/2009/08/29/fetching-smile/