F8 - go to the next newest unread link on hacker news. F9 - go to the comments for the link you are currently on.
There is also a gui that allows you to rate the site you are on, and this is mostly for a v2 of this plugin that will use a Bayesian filter or some sort of ML categorizer to figure out if you will actually like the link before sending you to it.
also coming in v 1.5 a way to block sites you don't want to go to.
