The Cubs enjoy a day off before facing their 2nd straight, and 2nd of 2008, lefty starter. Zach Duke has beaten the Cubs before, but they've had their days, too. See this post for more on that.
Here's Zach's stuff - 4-seam, 2-seam, change, slider, curve.
Broken into average pitch for each type:
Gameday's version of the pitch ID's