i think if for "--" vote monk must explain reason, and this reason will be /msg-ed to author of node (from "anonymous voter", of course) when author can take into account these reasons for future posts

An interesting idea, but I think it would just amount to flooding people on the Worst Nodes list. People will most likely get lazy and just send messages like "troll" or "homework." If they have something constructive to say they will probably just reply to the node.

use Your::Head;