Just watched the first episode of the new series, The Impossible Astronaut. It's good and promising, but not as scary as I thought it was going to be. I think the Silence creatures are not scary as much as intellectually disturbing. After all, you only remember them when you see them.
BTW, the Oblong Office is not the only relation to Discworld this episode has. I don't know whether anyone has pointed it out in this thread already (I'm not trawling through the pages to find out), but the Silent in the episode is played by Marnix van den Broeke, aka the body of Death in Hogfather and The Colour of Magic, and the body of Mr Pump in Going Postal.