Since I had a few minutes today, I went and added a new icon
which you'll find at the top of every post. If you select this icon, it'll automatically include that person into your ignore list.
To remove people from your ignore list (in other words, if you want to see their posts again), simply go to the URL referenced in the post above, erase the user's name from your ignore list, then push the "Update List" button.
Hope that helps!