I've always likes that the Beeb's iPlayer volume goes up to 11 (it does - go check).
I've just spotted a new smile inducing but practically useful feature Youtube have introduced: a lightswitch (may have been there a while I don't know).
You can watch a vid with the lights on...
Or if you find all the busy-ness distracting, flick the switch and watch with the lights out...
Sometimes the little things that make the difference!