In recent years, July 29th has been the calm before the storm for deadline deals.
Last year, not a single trade was made on this date. Same goes for 2004 and 2001.
We have to go back to 2003 to find a July 29th with significant trading. The Yanks picked up Raul Mondesi for David Dellucci and some bums. The Red Sox snagged Scott Williamson. And a few other relievers changed hands.
2002 featured a blockbuster that is still reverberating: the Phillies sent Scott Rolen to the Cardinals for Placido Polanco, Mike Timlin, and Bud Smith.