An anonymous commenter at my previous post mentioned the use of concrete-filled bombs by US aircraft in the Middle East to strike pinpoint targets while causing minimal 'collateral damage'. I was aware of this; there have been several articles discussing it since the technique was first revealed in 2009. Here's a useful one giving more information if you're interested.
I thought I recalled a National Geographic program that mentioned the subject, and a quick search on YouTube revealed that I was right. Here's a short excerpt from their 'I Didn't Know That' series. It's a bit oh-gee-whiz and over-the-top, but it's still interesting.
Thanks to our anonymous commenter for bringing the subject to mind.