Ezine Articles are in the process of implementing a new comments policy for their blog, and the good part is that they are also removing nofollow from the comments.
I love Ezine Articles, and the blog is one I read “religiously”. Bloggers can learn an awful lot from Article Marketing, and in fact I recommend that all bloggers also use article marketing especially when they have a new blog with low readership.
Optiniche has one of the best guides for creating a comments policy.
My own comments policy was prompted by Optiniche rather than inspired, though I have followed a lot of the general framework.
I rarely get human posted spam comments, and Spam Karma captures all the automated comments flawlessly.