The Bears announced today that they have signed one of their draft picks and come to contract agreements with two others.

Defensive tackle Marcus Harrison, a third-round pick out of Arkansas, signed a four-year contract. Harrison is a big talent with two big question marks: He suffered a torn ACL in the spring of 2007 and was arrested in August and accused of having an ecstasy pill and marijuana in his vehicle. If Harrison stays healthy and stays out of trouble, the Bears got a steal. If not, GM Jerry Angelo will have to answer why he used a third-round pick on a guy with character and injury issues.

Wide receiver Earl Bennett and cornerback Zack Bowman have not yet signed, but have both agreed to four-year deals. Bennett was a third-round pick out of Vanderbilt, where he was very productive as a slot receiver. He’s expected to get significant playing time as a rookie. Bowman was a fifth-round pick out of Nebraska whose knees kept him off some teams’ draft boards; he tore the ACL in his left knee in March 2006 and ruptured the patellar tendon in his right knee in March 2007.

The Bears always try to move quickly in getting their draft picks signed before training camp, and this year is no exception. Chicago has now signed or agreed to terms with 10 of its 12 draft picks, the most of any NFL team.