The success of 24 is due in large part to the blogging community. In the beginning of the series, 24 didn't move the needle much on the popular culture meter. But the small audience of early devotees was a passionate one. They blogged their enthusiasm all over the internet, show by show. Now there are a number of blogs specifically dedicated to the show, and here is a good start.
We'll be expanding the list shortly, so check back.