One of my favorite blogs is Josh Wilker’s Cardboard Gods. Josh takes a different slant than most baseball card blogs, which are mainly nostalgia. Josh uses one card to help tell some (often quite personal, sometimes funny and/or emotional) story about his own life, or about the world around him.
Several years ago he took some of his blog content, added several new entries, and turned out a book, also called Cardboard Gods. I highly recommend the book as well.
Note that we have a Blogroll over to the lower right. If you have any other blogs that are worthy of promotion via SABR’s Baseball Cards committee, let’s add them. Also, feel free to post about them as well.