As you can tell by the title I'm a huge si-fi fan. I just learned of the canncelation of Stargate Universe. Although they spent way to much time on character development it was a pretty good show.
Heroes was cannnceled. So no season5. I guess it was just getting to compicated for some.
Defying Gravity had the potential to be a really good show but was canceled after a single season(only aired 8 of 13 episodes in the US)
And well I'm at it I'll complain about a oldy but a goody FireFly the one season and the movie they did were great. Nothing is better than a si-fi western comedy (this is really a must see).

Things to look forward to is AMC's The Walking Dead, and Fringe.
I'm sure I'm missing some good ones but this is all I can think of at the moment.

Is there any other si-fi's that I should be watching?