Nice. It took me a couple to understand that C&D's were preferred to legal action (I received a few from some really big firms). While researching the issue, under a small bead of sweat, I actually found conference papers from the originating firms outlining the preference of C&D's to expensive legal action. My personal experience with them seemed like glorified take down notices, which were easily complied with, but the language can be damn scary.

They are serious business, but, if some of these cases can be handled as humanely as the OP's example, a lot of people could sleep better at night.