I assume you're asking about a plugin for Wordpress as I see that is the software running one of your sites. I don't know off of the top of my head if that is some kind of plugin for that, but I suggest that you look into editing your .htaccess file. I'm not sure but I would guess that something like that might solve your issue.
http://andybeard.eu/2007/02/ultimat...sh-nofollow-from-comments-and-trackbacks.html But u choose out of those many listed in above url..that suits your exact requirements..like blogroll-dofollow and post links-nofollow...once u choose a plugin let us know...
Yes for wordpress Fedorpheux . i forgot to state it at my post.. and thank sa123 for the cool link of plugins. KOjak
Andy Beard certainly knows his stuff in this regard. I'm curious though, why don't you want to share the link love with people you mention? You can always choose to selectively "nofollow" sites (Wikipedia for instance) by simply adding rel="nofollow" inside the URL. I prefer to give a little Google juice to those who I'm talking about, by way of a thank you.