I can't recall how I got there, but I found myself reading Kathy Sierra's Don't give in to feature demands!. Which recalled to mind Joel Spolsky's Set Your Priorities (I'm not as taken by Joel in general, but this one is spot-on). I guess this is one of those habit things - the advice is easy to understand when read, but it takes practise before you're in the habit of noticing it when it is going on.