Added by hansfn 2011-06-11: This extension is now available at extensions.pivotx.net - see http://extensions.pivotx.net/entry/56/uaincomments.
Information: http://pivotx.mobius-design.net/?p=useragent-info-in-comments
Demonstration: http://pivotx.mobius-design.net/?e=5
If you would like to display some useragent information (Operating System and browser used) of the visitors who comment at your site, this is the extension for you. I highly suggest going to both of the links above.
I've already got an update in the works further implementing remote resources, but that's not quite ready yet.