Pah, all ST and B5 is bobbins, the best sci fi in last 30 years has to have been the amazing Andromeda. Only kidding.
@Carl Williams: There is a bit of a dearth of "future" sci-fi at the moment, the tendency has been for more dramatic "near now" sci-fi, and for making it with very high production values. Shows have either had to be brilliant (BSG reboot) or long running (Dr Who reboot) to survive. We're missing a current show that has the appeal of an SG-1 though. Here are some current shows to look out for:
Alphas: Sci fi? It's 'Heroes' on the SyFy channel, with a little pseudo science thrown in. Bit too much magic, I wouldn't disagree with anyone who classes this as "fantasy" rather than "sci fi"
Continuum: Canadian time travel, eh? What's that aboot? It's not bad actually, but it's from cable, so only ten episodes a season, but not at the whim of Fox or NBC. I can't quite work out if it is paradoxical that the "good guys" in the future are actually right wing nutters, or if it is designed to appeal to Fox viewers. Hoping the former. Season 2 will be interesting as they delve into some of the paradoxes.
Falling Skies: Americans are loving these end of days kind of shows. This time, aliens invade, and for some reason want our kids to hook up their machines. Crazy.
Fringe: Coming to the end, definitely sci fi, but less believable as the series roll by. JJ Abrams designs shows that grab me for 5 years, I get to the end and the dénouement and think "WTF? What a crock." (see Alias, Lost). He's an evil evil fucker, and I love him for it.
Haven: Another SyFy show that has me asking "is this SF or fantasy?". Precious little science in the show.
Person of Interest: Is this Sci Fi? A computer that can track people around the world and predict if they are going to come to harm, and rings up a team of people to protect them. They don't go into the SF angle much until it's a plot device. JC is a badass.
Revolution: Ridiculous SF that I still watch. In the future, somehow electrons no longer flow, cue fall of civilisation. Some people have amulets that sometimes allow electricity to work. Add to that the dialogue is ropey and the acting (especially the lead character) is awful. I've not heard this getting cancelled yet, but it would not surprise me.
Red dwarf: Hah, still going. Don't like the new episodes though, give me "White Hole" any day.
Walking Dead: SF? Another near now apocalypse show, this time with zombies.
Warehouse 13: zomg, SyFy make some bad shows. I'll watch anything with Saul Rubinek in though.
Having said that, here's the recent sci-fi cancelled list:
Alcatraz - Interesting premise, too slow, cancelled. Could have gone somewhere, but got no viewers.
Dark Angel - I still can't forgive this being cancelled
Defying Gravity - liked it, it had promise, too slow (hence cancelled)
Dollhouse - Whedon lets another one get away
Eleventh Hour (US and UK versions) - both deserved to get canned
Eureka - ran it's course really, tea time SF
Firefly - Cap'n? Shiny.
Flashforward - cool show, but once you've done the flash forward once, what happens next season? Another flash? Please! (hence cancelled).
No Ordinary Family - Modern Family cross X-Men. Huge promise, ratings died on it, so it died.
Terminator: TSC - Good, but bleak. Could have had a third series if they'd tried.
Terra Nova - Can't spend that much per episode for that few viewers, hence cancelled
The Event - Aliens invade! I liked it, I think they were running out of ideas..
V - Hah. The first time I saw one of the lizard men pop out of a human skin, I almost wet myself laughing it was so ridiculous. I'm impressed this got a second series before being cancelled tbh.