Merriam-Webster released their list of the Top 10 Words of the Year. The list is drawn from the most researched words on Merriam-Webster's Web sites.
2004's top word is Blog, which has the following definition:
"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."
Follow this link to see the Top 10 Words of the Year.