Philosopher Walter Ott (Virginia Tech) writes:

I invite teachers of modern philosophy to download and modify an open-source text/work-book on modern philosophy. The book is largely drawn from public domain sources, with some material of my own. In addition to an opening "minilogic" chapter and brief introductions of the authors, I've interspersed study questions and fill-in the-blank reconstructions of arguments. My hope is that others will take this work and improve on it, or modify it to suit their own teaching needs. 

Please feel free to e-mail me (ottw@vt.edu) with any comments or suggestions.

You can download it as both .doc and .pdf, and read more about the project, here.