Great thread.
I love Terry Pratchett, especially the Discworld series, but also his other stuff. Love Douglas Adams, may he rest in peace. In my teens, I was very fond of Tolkien and I still think creating the universe of Middle Earth was a fantastic achievement. Apart from that, I don't read all that much sci fi and fantasy, although I've read some of the obvious stuff, like HP, some Brian Aldiss, Philip K. Dick, Arthur C. Clarke, Lem, Verne, H. G. Wells... Of the more recent stuff, I thought Game of Thrones might be worth checking out, but I haven't done so yet.
Concerning films and TV series, I'm a Trekker (my favourite is DS9) *and* a Star Warrior (original trilogy only), and I love classics such as Metropolis, 2001: A Space Odyssey, Blade Runner...