This is a simple Greasemonkey script that adds keyboard shortcuts to Reddit. Ya, I spent over an hour building something that will save me just a few seconds each day…

Get it from here, or from Userscripts.org.

The keybindings are:
j — Go to the next article
k — Go to the previous article
v — Open current article in a new tab or window (You may need to configure the popup blocker to allow popups from Reddit)
u — Up-vote current article
d — Down-vote current article
? — Display help

The one thing the script is missing right now is support for ‘unlimited’ scroll—going to the next page when pressing j on the last article of the current page and so on. Will work on it next.