You can also bookmark the filter instead of your regular friends page, and that way you just get to see the posts in that category. It's quite useful, because if you dump someone from your FL they get an email telling them of the dumping, whereas this way they're still on your main FL but you don't have to read them.

(A couple of people in my FL posted NSFW images in the past, and my PC is in the lounge where the kids can see the screen. Instead of dumping them I just filtered their posts out. Everyone's happy...)