Although there has always been a fan base that has discussed science fiction worlds in detail, exploring the mythology, drawing connections between episodes/movies, and complaining about continuity errors, the present day provides far more opportunity to do that, with blogs, discussion boards, and countless other forums for interaction.
IO9 has some speculations about connections between the Doctor Who episode The End Of Time and past episodes and characters from the show. One thing I learned in the process is that Richard Dawkins, the biologist, is married to Lalla Ward, who played Romana.
Heroes, Dollhouse, and (finally!) Chuck will be returning this week or next.
Sherry discusses maturity (a subject that came up recently on this blog).
Ben Witherington blogs about the Conservative Bible Project.
Claude Mariottini addresses Southern Baptists praying for the death of Obama.
Open Parachute has a great cartoon about how the internet brings us together: