Baseball America has a pretty sweet database (the link gets you to the point of this post) of the Minor League Free Agent tracker.
Here are the remaining unsigned minor league free agents who spent 2011 with the Astros organization:
LHP Kristian Bueno, C Robinson Cancel, 1B Koby Clemens, RHP Sam Gervacio, RHP Brad James, OF Drew Locke, 3B Jhonny Medrano, 3B Oswaldo Navarro, LHP Ryan Rowland-Smith, 2B Jose Vallejo
We didn't come out here to play tiddlywinks, son.
-Hal Smith
