6:18pm: Ken Rosenthal calls the Cards' interest "mild, for now." However, Jon Heyman has a few updates on the proceedings--as noted in the past, Cards manager Tony La Russa is said to "badly" want Holliday. Heyman also reports that the Cardinals might want the A's to pay a portion of the $1.8MM bonus Wallace received after the 2008 draft.
3:41pm: SI.com's Jon Heyman says the Cards are "seriously pursuing" Holliday, possibly for Wallace. The Tigers are also in the mix for Holliday.
12:55pm: ESPN.com's Buster Olney says the Cards and A's are indeed discussing a possible Wallace for Holliday trade. One of Olney's sources says the odds of a deal are 50-50. The Cardinals ownership may be prepared to take on salary, or the A's may pay a portion of Holliday's contract to obtain a better return.
10:00am: Susan Slusser of the San Francisco Chronicle hears that the Cardinals might be readying themselves to part with prospect Brett Wallace for Matt Holliday. The Cardinals need a bat to protect Albert Pujols and Holliday has a .310/.416/.492 line since May 5th despite a well-documented drop in power. He's walked 41 times in that span and continues to play above average defense in left field.