Your run cadence is one of the biggest determining factors of your run speed and ability. Most athletes give it lip service, not realizing that a slow cadence means slow pace. If you want to improve your run cadence, (keeping it ideally in the 90's), then you should use some simple technology which may already have.
If you have a Garmin, or some type of speed-distance device with a foot-pod, (Suunto, Polar, etc), like the one in this image below, you have all you need to improve your cadence in only a matter of a few weeks!
Simply take your watch, and set the screen so the only thing you see on it is your cadence. It helps to take away your pre-conceived notions about pace and intensity, and let's you simply focus on ONE, SINGLE ASPECT of your running technique.
Checking your cadence by counting every few minutes won't do as well as this, because when you are counting your steps you will likely cheat and focus on it more, even if you don't mean to. The point is to make it a natural habit, not just when you focus on it.
One of my athletes came up with this idea, as we have been working on his cadence, and it has done wonders for him. If you have a GPS or foot-pod compatible watch, invest in the foot-pod and do this a few times per week. You'll be impressed with the difference a few weeks of focusing on cadence can do for you!