Take a look at this:
http://asksasha.com/Running/Top-10-Training-Mistakes.htmlMy responses- if you want to BQ this fall/winter, I would not recommend doing another marathon before then. Do 10k's, 1/2 marathons, and long runs, but no marathons. It won't help you.
To get faster, the best thing you can do is run consistently and increase your miles. If you can do 8 miles/day everyday, do it. And add long runs. Don't just increase your total mileage, though- slowly add on using some reasonable measure (i.e. the 10% rule, etc). Looking at your blog, you ran 10 days in Feb, 14 in Mar, and 14 in Apr. In other words, you only ran 33-50% of the available days. To get faster, you need to be more consistent!
As for pace, don't push the pace much while you are increasing your mileage. You will naturally get faster. If you want some speed variety in your workouts, you could certainly add a reasonable tempo or fartlek every so often. And do some strides every now and then. But increase your miles and consistency, and you will see improvements in your marathon time.