Baseball Blogs - Features many weblogs devoted to individual teams, multiple teams, or the sport as a whole.
Baseball Think Factory - A collection of essays on baseball's economics and sabermetrics, along with the Baseball Newstand, and a collection of links to baseball media and columnists.
Blogging Baseball - All-time baseball highlights and real-time commentary.
The Diamond Angle Baseball Magazine - The Diamond Angle is a small baseball magazine published out of Hawaii. Features include interviews, photo albums, past player profiles, and book reviews.
RobNeyer.com - The official site of ESPN baseball journalist Rob Neyer. Features regular columns from Rob and others. Heavy focus is on the Kansas City Royals, of which Neyer is a die-hard fan. He's also written a book called "Baseball Dynasties" and does radio appearances on ESPN Radio.