My current favourites are NCIS:LA, NCIS, Criminal minds, all flavours of Law & Order and CSI, Bones, Glee, Expert Makeover Home Edition, lots of the home improvement ones. Older things loved include Buffy, Charmed, Grey's Anatomy, the one with Matt thingy from Friends acting as himself.
DH's current favourites are Midsommer Murders, Lewis, Poirot with David Suchet and actually most things Agatha Christie, Boston Legal, Rugby Club and any rugby matches and question time.
We both love the Mentalist, QI, Big Bang, and I'm sure there are more. Also all sorts of documentaries - Howard Goodhall on history of music was fab, there was a great one on the history of maths and stats recently that was good, another one about the Google and their vision for a world brain that happened to include them gaining copyright to all out of print and out of copyright books in the world
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All time joint favourite was Couplings - very funny.
DC's favourites are Phineas and Ferb, Scooby Doo, Tom & Jerry, Asterix and TinTin films, Art Attack, Cat in the Hat (and 64 Zoo Lane for calming down before bed, not that they admit it anymore!)
DC1 (7) also likes Deadly 60, GBBO, all sorts of documentary programmes (aimed at kids or adults) on nature, cars, how things are made, history especially if it involves stuff he's doing at school (currently Egyptians and Ancient Greece).
DC2 (4) also loves things like Mickey Mouse Clubhouse, Alphablocks/NumTums/Get Squiggling letters, Jake and the Neverland Pirates, Doc McStuffins, Spongebob and Handy Manny.
I don't really like them watching things like Ben 10, Spiderman, Pokemon, Transformers, PowerRangers etc - not least because they then tend to re-enact and play at these, which invariably leads to them playfighting and somebody getting hurt. DC2 in particular has a habit of ending up very inspired by the kung fu type moves - which is not so good when you end up on the receiving end of them!