There are no people on my ignore list. I've never used the ignore function, and I never will. Some people have bugged me on various occasions and there are a select few on here who I do not care for at all, but I think purposefully blocking those people out would be quite useless. You can't do it IRL, so why do it here? Just 'cause you can, I guess.
I also think blocking out anything, whether it be avatars, siggies, whatever, is quite disadvantageous to one's self. I like seeing the real LPSG, not the version I'd like it to be.
And trolls? They are endlessly amusing and there's no way I'd ever block myself from being able to see their trainwrecks out of here. The assholes here who border on being trolls eventually burnout, so I don't really see the need to ignore them, either.