My 6 yr old and I are working our way through Eureka on Netflix. We watch an episode during dinner.
As for iconic movies/shows- Both of my kids have seen E.T. and liked it. The older one has watched the Paul Dini Batman series, and is currently hot and bothered over ReBoot. He's watched most of Warehouse 13 with us, seen a bunch of Stargate SG-1 and he's watched Firefly all of the way through. Farscape failed to hold his interest, though.