The Cardinals' other prospects included in the deal are, according to Tim Kurkjian, outfielder Shane Peterson and righty Clayton Mortensen.

(add 3, 9:35 a.m.):  Buster Olney reports that the A's are paying $1.5M of Holliday's remaining salary, leaving the Cardinals on the hook for approximately $4.5M. 

More updates in this post forthcoming.

(add 1, 8:35 a.m.):

Here is a link to Kurkjian's article.

Here is Peterson's complete college and minor league statlines.

Here's Mortensen's stats.

Here's Brett Wallace's.

(Those links are to thebaseballcube; to see pictures of Mortensen and Peterson, as well as their split stats, click on the two links provided by flipgatey in the third comment below).

(add 2, 8:50 a.m.):

Buster Olney echoes Kurkjian's information as well, including prospects coming in return:  Wallace, Mortensen, Peterson.