Ran across this info.: http://stl-sabr.bajink.com/fungoes/?page_id=736 and thought I'd share a few of Walt's noteworthy deadline deals from his St. Louis days. Apologies in advance for any errors as I typed this up in a hurry.
7/31/97: Traded Erick Ludwick, TJ Matthews, Blake Stein for Mark McGwire.
7/31/98: Traded Royce Clayton and Todd Stottlemyre for Darren Oliver, Fernando Tatis, and Mark Little
7/31/99: Traded Shawon Dunston for Craig Paquette
7/29/00: Traded Chris Richard and Mark Nussbeck for Mike Timlin and cash.
7/31/00: Traded Jose Leon for Will Clark and cash.
7/31/01: Traded Jason Christiansen for Kevin Joseph and cash.
8/2/01: Traded Ray Lankford for Wood Williams.
7/19/02: Traded Coco Crisp and Luis Garcia for Steve Finley
7/29/02: Traded Placido Polanco, Mike Timlin, and Bud Smith for Scott Rolen, Doug Nickle, and cash.
8/6/04: Traded Jason Burch, Luis Martinez, and Chris Narveson for Larry Walker.
7/5/06: Traded Terry Evans for Jeff Weaver.
7/30/06: Traded Hector Luna for Ron Belliard.
7/31/06: Traded Rich Scalamandre for Jorge Sosa.
7/31/07: Traded Sean Danielson for Joel Piniero.