From Michael Gartenberg:

Last night blogging hit this weeks episode of the West Wing. This is the first time I know of where weblogs played part in the storyline of a TV show. It was interesting how the weblogs were portrayed.

I am sure there are more, but on April 1, 2003 an episode of CBS’ Judging Amy had a character’s blog have an impact on the storyline.

Who woulda thunk Judging Amy was hipper than The West Wing?