Battlestar Galactica - the recent TV version. Although i never fancied it when it was first anounced (i was never a fan of the original TV show or film) i'd read too many good recommendations for it, and happened across a special feature length episode, Razor, that was due to be aired the next day. I recorded it and watched it with my wife and both liked it, so ordered the Seasons 1-3 box set on Amazon the following day. We've become pretty much addicted to it now and are halfway through the second season already, watching at least 2 episodes every night since it arrived.