One of the more significant additions that I've made to my training for Boston is what I do the day after a hard workout.
Nine of the last 12 weeks I've run a 13-15 miles the day after a hard workout. I've never done this before - it seems to help both physically & mentally. Physically, my body is having to adapt to a relatively long run when it's already depleted. But, I think the most positive effect is psychological. Even though the pace isn't too fast - it feels like I've accomplished something when I look at my watch and see that I've run 90+ minutes in the middle of the week.
Although I haven't been posting it on my blog - I've been lifting weights on most of these days as well. It's nice to have a different physical activity to mix things up a little - and my wife thanks me for not wasting away completely.