Note that there's an Anti-Akrasia technique in here waiting to happen: If you can increase the delay of a rewarding but unproductive task that otherwise has no delay at all then you reduce your motivation to do it.

Internet browsing comes to mind. I think the XKCD author has done something to this effect (check out the comic's comment here: http://xkcd.com/862/). To quip, he wrote a script that made his computer freeze for thirty seconds every time he opened unwanted material.