One of my favourite blogs at the moment is Language Log. There are few days when it doesn't produce something that is entertaining and educational.
In my younger days, when I had more hair, and black t-shirts with silver lettering on them, my musical tastes focused on heavy metal and prog rock. Of course in those days prog rock was real prog rock, and it was more important that heavy metal was loud than that it was fast. It was in the midst of that halcyon daze that the heavy metal umlaut (or should that be 'ümlaut'?) came into existence. I am grateful to Language Log for alerting me to just how far the thing has spread.