Narrowing down a research topic

This week, we're spending a lot of time with Thesis Seminar student researchers in narrowing down a top.  I've been putting together some ideas on how to do this, but am curious what others are doing.   A lot of what we are discussing comes from Booth, Colomb, & Williams (2008), and Machi & McEvoy (2009).

What are some good books on organizing a thesis/dissertation paper, forming arguments, logical reasoning, etc.?