BattleStar Galactica. Not the old ones... the NEW ones.In my opinion, this series is what all SCI-FI's should strive to be like.
District 9 (the movie from was it 2010 or 2009?), I liked it on many aspects.Alien Nation although it's only 1 season and probably axed duo to network reasons after the first season, it was a fun series to watch.
Hmm.... Movies Dark Star - an old 'B-movie' sci-fi comedy...well, dark-comedy really. Red Planet - Val Kilmer crashes on Mars... Taken - Mini-series from Spielburg about alien abducties. Battle Beyond the Stars - An old space-opera-ish flick, starring that guy who played John-boy Walton on the Waltons. Wall-E - Earth is trashed, humanity has fled to the stars and clean-up robot Wall-E hitches a ride to bring life back to Earth. Solaris - A scientist leaves Earth to find out what's happened at a research station in orbit over a strange planet.
Sci-Fi-ish Documentary Alien Planet - Explores what a futuristic probe sent to a nearby star might find, with input from many sciencey types, including a few words from Stephen Hawking. Has some very imaginative ideas.
Anyhow... there's a few off the top of my head that may not be as main-stream and popular, and therefore may have a higher chance of not having been viewed by you...err, with the exception of Wall-E, which I just like because it's a sci-fi Pixar flick the whole family can enjoy.
Spaced Invaders.