The Cub Reporter and Chicago Cubs Minor League Baseball both link to the list of Cubs' minor league players who filed for free agency:

C Jon Sprowl
1B Brandon Sing
2B Andrew Lane
SS Pedro Lopez
SS Augie Ojeda
OF Jeff Deardorff
OF Nic Jackson
OF Luis Montanez
OF Mike Restovich
OF Gordon Weston
OF Jake Whitesides
RHP Hugo Castellanos
RHP Wilton Chavez
RHP Brandon Emanuel
RHP Mike Garcia
RHP William Gwaltney
RHP Kerry Ligtenberg
RHP Brian Reith
RHP Mac Suzuki
LHP Cliff Bartosh
LHP Carlos Perez

I have written about Luis Montanez before here and Nic Jackson before here. Things haven't gotten much better for those two since those articles were written in 2004.