There's some great programs on Sci-Fi at the moment. First up is The Visitor. A series created by the same guys behind the movie Independence Day. It's about an air force pilot, Adam MacArthur, who mysteriously disappears over the Bermuda Triangle, only to appear 50 years later totally unchanged.
And then there's John Doe. It's about a man who knows everything - except his own name. This series has particularly impressed me - a great concept and brilliantly written. As is the way with sci-fi shows in the US, John Doe was cancelled after one season, and The Visitor after 13 episodes!