Im not sure about this. should the person who asked the question not be able to be the only one who says if the answer was useful or not ATM all users can do it.
Does it matter what other people thinks is helpfull? Should it not be the person who asks the question is then the judge if its usefull?
PS, Its failed logic but you knew i would say that hey

People dont think within the net and expecting people who get RTFM one liners to say its un-usefull and anything else as usefull doesnt make sense. Hasnt a trusted source or mod have a -7 rating? The only reason i can see for this is to get other people (not regulars) to post moe regularly since everyone really wants to be a trusted penguine
But I can see the point for posts when people post a hundred differnt ways insted of waiting for a reply to the suggestion given but what the motivation behinde this is it better for the visitor cause thats who's king.
ADD := also if you think about it how can this be used to choose trusted penguines what if someone knows alot about GNU/Linux and is very clever but only makes a couple of posts a month this means he can never get as many votes as a regular poster but is more knowegable then the user who posts more, Isnt the point of trusted penguine to show someone knows more the most of the normal posters??
I still smell the point is to get more regulars in !!