I've changed my training method a little bit. I am following one of the plans from the "Road Racing for Serious Runners" by Pete Pfitzinger and Scott Douglas (very nice book).

The main changes are more quality work, and somewhat higher mileage (but not much). Last week's speedwork was 4x1000 meters on the track: my splits were 4:01, 4:04, 4:03, 4:02 with 400 meters in ~2:15 recovery in between. With he warmup and cooldown I covered 6 miles. Last night I ran 8 miles at sub 8:30 min/mile pace. I like the book's philosophy about faster long runs and longer intervals. Seems like it makes me work harder without overtraining.