Exercise: Who Knees It?

Yeah, so about that running thing I've been doing...
Well, it's on hiatus.  Last Tuesday, I went for my regular run/walk (actually turning up the heat to a frothy 20 minute regimine of sets of 90 seconds of jogging followed by 2 minutes of walking) and got home, feeling good.  Next day I started having pains in my knees, and they've hung around and still pain me today.
Now, I get pains in my knees all the time, or specifically, in one of my knees.  Back when I was in university, I played some rec-basketball and twisted my left knee pretty badly.  Ever since then, it will occasionally just pop out (usually if I'm walking down stairs) and cause me a couple of days of intermittant pain and discomfort.  Then it goes away.
This is just like that pain, only a bit moreso, and more constant, and in both knees (although the right knee pales in comparison).  It's been bothersome for about a week, but today I sense it improving.  If it continues much longer, I'll have to get it looked at.
So, no more running until I'm well and truly recuped.
Can't say I miss it, though.