From the MLB.com transaction page:

Oakland Athletics Agreed to terms with C Matt LeCroy on a Minor League contract; Non-roster invitee C Jeremy Brown announced his retirement.

It's not an article yet on the A's team site, but I'm sure it will be by the end of the day. This obviously doesn't have any major impact long-term, but Brown was one of the most entertaining storylines of "Moneyball" as a heavyset, unathletic catcher who tore up the SEC. Michael Lewis used Brown and the conversations surrounding him in the A's draft "war room" to help tell a story of the debate between scouts vs. stats in the A's front office as the team prepared for '02 draft. Thus, his retirement is symbolic. Jeremy Brown is perhaps one of the most famous players in history to have absolutely zero impact as a player in the Major Leagues - he's probably on a short list with Michael Jordan of the Birmingham Barons.