I have been catching up on a few series that I missed when they first aired, as well as some recent stuff that hasn't actually aired here yet.
- 3rd Rock from the Sun
- Alias (seasons 1, 2 + 3... I lost interest with 4)
- Alphas (season 2 is currently airing I believe)
- Archer (I think there are 3 episodes of season 3 airing in September)
- Battlestar Galactica (I really like the way this is made, but have to admit I got sidetracked in the middle of season 2 and haven't been back to it yet)
- Being Human (the UK version... lost interest with series 4 when the characters changed though)
- Bionic Woman (I thought this was actually quite good, little miffed that it didn't get continued)
- Black Dynamite (currently airing season 1)
- Continuum (first couple of episodes were great, I thought they were going to drop the ball with 3rd and 4th but it was good from ep 5 onwards and I am certainly hoping there will be a season 2)
- Doctor Who
- Don't Trust the B---- In apartment 23
- Eureka (I think this has steadily got worse as it progressed, but the first season or two are pretty entertaining)
- Farscape (I think my 2nd favourite sci-fi series overall, but has my favourite sci-fi episode of all time: Through the Looking Glass)
- Futurama
- Heroes (season 1 + 2... 3 started going downhill steeply to the point that I have now twice tried to watch past the middle of it)
- Jake 2.0 (not a great start tbh, but it did get better as the season progressed... probably only worth it if you have similar interests as me [I like the whole super-human working in secret subject] though I thought Bionic Woman was a better show and was a very similar subject matter)
- Lost Girl (great fantasy about a succubus and various other fae mythology, I am eagerly awaiting season 3)
- New Girl
- Nikita (currently a little way into season 1, it's good, and getting better... reminds me a bit of Alias)
- Pushing Daisies (quirky little series about a guy who can bring people back to life with a touch, but touching them again means permanent death... and his struggles to have a relationship with a girl he brought back to life, and thus can't ever touch)
- Sanctuary (I have to admit I am struggling to hold an interest in this, I think it's partly Amanda Tapping's 19th century British accent. Still it must be good for some people as there are four seasons, I'm half way through the first)
- Stargate SG-1 (My favourite sci-fi series, though the Ori story arc wasn't that great)
- Stargate Atlantis (I like this, but still find I don't like the characters as much as SG-1 and SGU, which is why it's the only Stargate series I have only seen once through)
- Stargate Universe (took me a while to get into, but now that I have seen it through twice I wish it had continued for at least another season [though I will admit the way it finished was good, and didn't leave annoying cliffhangers like some cancelled shows do])
- Suburgatory
- Veronica Mars
The bolded are highly reccomended by me (or ar at least worth watching the first season even if later seasons went downhill) The italicised I haven't really watched enough of to form a solid opinion yet, but I am enjoying them so far. As for the rest, some are good, some I find mediocre but may be of more interest to you.
