Dallas--I2 Technologies Inc. has tapped Greg Brady as CEO. Brady, formerly i2's president, replaces Sanjiv Sidhu, who will retain his chairman title. Brady, a seven-year i2 veteran, will oversee all aspects of the company, a developer and marketer of b-to-b software. I2's management changes come several days after Keith Krach, CEO of rival Ariba Inc., ceded his CEO post to Larry Mueller, formerly president-COO. I2's stock price has rallied in recent days, trading in the high teens, up from a 52-week low of $12.56, but still down from a 52-week-high of $99.43.