The alt text of today's xkcd reads:

After years of trying various methods, I broke [the habit of clicking on my favorite distractions every 5 minutes] by pitting my impatience against my laziness. I decoupled the action and the neurological reward by setting up a simple 30-second delay I had to wait through, in which I couldn't do anything else, before any new page or chat client would load (and only allowed one to run at once). The urge to check all those sites magically vanished -- and my 'productive' computer use was unaffected.

Anyone have ideas about how to implement this? On Firefox one can always use LeechBlock. On *nix systems there would be a number of ways of implementing this, but not all of us use that OS or have the necessary savvy. 

(I'm kind of surprised no one's made a discussion post on this yet.)