Enjoyed reading this thread. Generally agree with a lot that's been said.
TNG best Trek - especially from season 3 onwards and 'Inner Light' is a lovely episode.
B5 was great, and mostly stands up fairly well to the passage of time - we recently watched it all again on DVD. I think the main problem with season 1 was a really really really wooden performance from the guy who played Sinclair. Things got much better once Sheridan arrived with a bit of charisma. I imagine Harlan Ellison's involvement helped a lot with the overall quality and SF cred.
I loved Firefly and still feel sad there's only 14 episodes. You can see the seeds of where a lot of the characters might have been going if there had been more. Great dialogue writing and especially great casting of the key roles - all the principles are just right imho and we especially liked Adam Baldwin as Jayne who is often hilarious and sometimes really poignant. Some of the stories have weaknesses but 'Out of Gas' is a classic of TV SF for me.
Then there's Battlestar Galactica, which has raised the bar so much I'm still in awe of it. Ron Moore said he wanted TV to finally take the genre seriously and I think it's achieved that on every level except perhaps finding a really big audience. As the end approaches I've been slightly nervous that they might go and spoil it all with a naff conclusion, but the jaw dropping mid season 4 'finale' has reassured me a lot. I thought the 'All Along the Watchtower' double episode at the end of season 3 was absolutely knock out. (Could Bob Dylan or Jimi Hendrix be the 12th Cylon???



)
I've often found myself looking wistfully at favourite novels by the likes of Dan Simmons, Alastair Reynolds or especially Richard Morgan and wondering if Ron Moore has read them and might want to do something with them...
FWIW my favourite SF movies, some of which are probably for sentimental reasons:
Blade Runner
Alien
Serenity
Forbidden Planet
Screamers (though flawed, I really like it)
Silent Running
The Day the Earth Stood Still
Invasion of the Body Snatchers (the first one)
2001 (though it's a bit self-important)
2010
Solaris (the original is
very long but brilliant, the Clooney version is pretty good too)
Star Trek: First Contact
Can anyone remember the name of the movie that was basically High Noon in space with Sean Connery?
Also I have very positive memories of a TV version of The Martian Chronicles from way back, which had Roddy MacDowel in the cast. Not sure what it would be like now - must see if there's a DVD release...