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.