We have installed a new more comprehensive ignore system. This new system allows you to ignore forums, threads, and threads started by people on your ignore list. It currently ignores these items when you are browsing the forums (you don't see threads or forums you have ignored), in search results, on New Post link or Today's Posts. It also skips them if you are using the next/previous thread links at the end of the threads. It will also keep these threads from showing up on the portal too.
To select a forum to hide you need to select the Forum Tools drop down and then select hide forum (see attachment). To select a thread to hide, use the Thread tools drop down and select hide thread (see attachment), to ignore threads started by people on your ignore list, go to the bottom left of the User CP where you will see a settings link and check off the box to ignore their threads.
Once you have ignored these forums and discussions you will not be able to see them in case you want to unignore them. So if you do want to unignore them there are tool in the bottom left of the UserCP to manage the items you have selected to ignore.
So now if you don't like the a certain forum, just hide it. Same goes with threads, if one is bugging you, just hide it. You can even hide threads based on tags. If you chose not to hear anymore about an ignore system feel free to hide this thread too!
As always, you can still choose to ignore a post for a single member by adding that name to your ignore list in your user CP. Look for the option in the left side menu under Settings and Options.