The negative captcha trick is a great solution to protect against robot spam.
Both BlogSphere and the IBM Blog template ( previously DominoBlog ) both use a different method where the act of clicking the submit button runs some javascript to add an extra aprameter to the http POST request, this is then checked by the server. Robots just use a simple submit and can't run the javascript so both those templates are protected from robot spam also.
But there is one other type of blog spam that there is no way of blocking and that's the stuff that's entered manually but people. It doesn't happen often but it does happen. The only way of blocking this is to do it manually, either by locking old entries down like Jake has suggested or by moderating all comments.
The negative captcha trick is a great solution to protect against robot spam.
Both BlogSphere and the IBM Blog template ( previously DominoBlog ) both use a different method where the act of clicking the submit button runs some javascript to add an extra aprameter to the http POST request, this is then checked by the server. Robots just use a simple submit and can't run the javascript so both those templates are protected from robot spam also.
But there is one other type of blog spam that there is no way of blocking and that's the stuff that's entered manually but people. It doesn't happen often but it does happen. The only way of blocking this is to do it manually, either by locking old entries down like Jake has suggested or by moderating all comments.