Yup, it's at:
And, from reading the first two threads (excuse me, um "fanposts"), it looks like it could be pretty nifty. He comes across as pretty genuinely interested in interacting with the readers, and already has a couple answers to posts up there. He's crazy if he thinks he can keep up with the stream of questions he'll get, but even if he can settle into some sort of selective cherry-picking every so often, it's a cool move forward in this information age.
Future Redbirds has recently had some great interviews with Jeff Luhnow, the Cards' director of player development. Between real-time interviews like that and blogs started by the SD front office, is it safe to assume we are starting a new age of front office interaction, where we can at least some prospect news directly from the source? 5 years ago , the Chris Perez callup "story" would have been broken only by the press; now it is broken by bloggers; in 5 years, will it be released directly by the Cards GM?