First answer, add his IP to the Comment Blacklist.
Second answer, select “An administrator must approve the comment (regardless of any matches below)” in Options/Discussions.
what and where is this blacklist of which you speak and how speficis is it with regards to I.P. address. I asked because the person seems to be on my own network (which is pretty huge) so i wouldnt want to block the entire network since most of the persons who post do so from within this network.
The Blacklist is found in the Options/Discussion panel of WordPress v1.5. Entering an IP address into the Blacklist would automatically delete all comments posted from that IP. Entering an email address would also delete all comments posted with that email address. More info: http://codex.ww.wp.xz.cn/Combating_Comment_Spam#Comment_Blacklist
If you have not upgraded to WP v1.5 yet, do so now. Follow this guide: http://www.tamba2.org.uk/wordpress/upgrade/
Thanks alot. You’ve just made my blogging experience alot more fun. Thanks mang!