Plurktionary

There are some cool keyboard shortcuts available for those that don’t want to be bothered with the mouse.

V = View new responses and also View all messages - Toggles
M = Mark all as read
% = Move forward in Timeline (works best if you have moved back in the timeline and would like to move forward a little at a time, a little buggy, must click in timeline between each use.)
& = Move backward in Timeline (only moves a small amount)

Arrow keys will scroll forward and back through the timeline more effectively than the other shortcuts.