FYI: Ignore Poster feature
1. Click on "User CP" link (top left; after sign-in)
2. Once inside User CP, look down the left hand column to find "Edit Ignore List" link and select it.
3. Then just type in the user name of the user you'd like to ignore and click the button to the right (never see their posts again until you decide to remove them from your list).
I have not used this feature myself (yet), however I'm pretty sure the only time you may see a post by a user on your ignore list is when someone else quotes the user's post in a thread.
I've seen this in action on many large boards and it's very useful to those who take advantage of it.