Source: http://www.mlbtraderumors.com/2010/07/dbacks-designate-dontrelle-willis-for-assign

According to the article they have DFA'd D-train to bring up Norberto. I'll miss him I was really hoping he could turn it around out here in AZ.  Oh man, what a fall from grace for Mr.Willis 2003 rookie of the year, to being DFA'd twice in one year ouch! Well when there is good news, I guess there is some bad news, but I don't know if this constitutes as bad news.

More analysis from snakecharmer:

Dontrelle Willis started off well with Arizona, throwing 6 shutout innings in his first start June 5th. But he continued to have problems with his control, walking 27 batters in 21 1/3 innings as a starter. He was then moved to the bullpen and allowed 3 earned runs in last night's blowout to the Dodgers.

Jordan Norberto started the season with the big league club as the team's only lefty reliever. He was used sparingly - only 3 total innings in 6 games. He allowed 3 runs in 2/3rds of an inning in San Diego for his only rough outing. According to Steve Gilbert on Twitter, Norberto is already in the clubhouse, so he should be available this afternoon.