Ravings and Blather

All my miles are slow, I not sure what the distinction is of the above.  I am joining this blog in an attempt to be just a little more like Nick.  So, I will send out a Ping and see if I get a response.

Ran 6 today.  1-8:27 2-8:19  3-8:58  4-8:21 5-8:10  6-8:26   avg 8:29 as usual

Today was actually the first I've felt good in many weeks.  Busted nut on Left is still distressing quite a bit.

Ran 4 today only because of signing up for this blog, so it is having an effect already.  Thanks for making this forum a positive place.

Today was a blizzard in the am, thats why I ran at noon, beautiful.  Pace was 8:29 8:30 8:02 8:02.  And as a bonus nobody stopped me to ask me if I needed help. 

Is the only way to get faster doing sprints?  Or can I just think I'm fast and get faster?  Ha Ha.  Welcome any advice?  What is the minimun mileage weekly to get stronger at a half marathon?