2004 has been the year of the blog. The BBC reports that the word “blog” has now been included in the Merriam-Webster dictionary. The definition reads: “BLOG noun [short for Weblog] (1999) : a Web site that contains an online personal journal with reflections, comments, and often hyperlinks provided by the writer.”
Contrast that with Wikipedia’s entry. I think that this is similar to the difference between the Encyclopedia Galactica and the Hitchhikers’ Guide to the Galaxy on the subject of Pan-Galactic Gargle Blasters.