Over the last 6 weeks, I've found that I'm continually running 9-minute milers. However, in the last week, I've been running in the high 7s/low 8s and have been very consistent. I'm not sure if it's a matter of mind over matter, weather, etc. Regardless, it's nice to see an increase in speed.
That said, I don't want to lose sight of why I started running in the first place--fitness and more importantly, weight loss. I've been starting to look at a book by Stu Mittleman, "Slow Burn" which talks about working with your optimal heart rate rather than trying to set a land speed record. It's something that I want/need to be conscious of, especially since I'm not trying to win any races, but just generally complete them with a reasonable time and improvement from the previous time.