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<script type="text/javascript" src="http://(shortname).disqus.com/combination_widget.js?num_items=5&amp;hide_mods=0&amp;color=white&amp;default_tab=recent&amp;excerpt_length=100"></script>
 1) Replace (shortname) with your Disqus forum shortname
2) excerpt_length = character excerpt limit from comments
3) hide_mods = hide moderators. 1 to enable, 0 to disable.
4) num_items = number of items per list
5) color = color of widget. You can choose from white, red, green, etc. You can use CSS to style this Disqus widget if you want.
 Note: This widget is the combination widget. I don't know the direct script for just the recent comments widget.