Composition is something I constantly have to work on, so I appreciate all the advice and links here.
One of the best photography books I own is Bryan Peterson's "Understanding Composition Field Guide." It is clearly and concisely written with wonderful photos to illustrate his points (shows the good and the bad). I'm reading it for the second time and plan to read it a third. With lots of practice on the points he makes, of course.
I've also learned a lot from watching Scott Kelby and Matt Kloskowski (sp?) doing blind critiques on "The Grid" (free online on Kelbytv.com).
Thanks for the book recommendation, I seem to always prefer a physical book to look at.