I've started that some. There is a high school track very close to home and me and workout buddy will go there for some speed drills. It's not very scientific though! Normally goes like this:

1 lap around track at 75% "full speed"
Trip to the bleachers repeated top to bottom 3 times

We do this circuit until either someone gives up or we reach 1 mile of track running, don't know what the bleachers add to that.

I've been looking through Youtube for speed drills! Best I can get to that's free!