Navigate using j and k on keyboard

Ever since I first used bloglines I’ve been trying to use j and k shortcut keys to navigate blogs and websites. I’d love to see browsers implement it as a way of moving between headers in page content (are there accessibility issues with this?). Thanks to this article on new wordpress plugins, I’ve been able to add the functionality to the index and archive pages of this blog using the Prev-Next Keyboard Navigation plugin. Try it out.