I've just started noticing this too. I noticed when 10 pounds made a huge difference, but now all of the sudden, these last 5 made a noticeable difference. Of course all five came off from the same place!
I'm really excited to see what happens with next 15. It kind of makes the long time it takes to a lose a pound a little more worth while.
You're doing great!
I just peeked at your most recent update photo. You are absolutely stunning!