Graham TechnoSparks no filters like blogs "badwords" are implemented yet
I will add a request to base camp for those and admin approval
But I do not know when or if it could be implemented
you can turn off "guest posting" and ban users etc

ahh I just realised you were talking about the blog
badwords="comma,separated,list,of,banned,words"
comments_disable_links ="1" converts links to text
see http://forum.xtgem.com/index/__xt/post-out4cm0qo8iwxz5k7e71gf4oy0ca8uijl5w7.html
for blocking images from comments
and again site options and "logged in users only"
the same functions and scripts can be used on the guestbook function