Great idea for a thread. Thanks for starting it. I usually ask photo related questions on another set of forums, but there are probably more people here that can use advice.

My question is concerning composition. I am familiar with the rule of thirds and fill the frame but struggle with composition still, as I am not very artistic by nature. What are some good sources to learn more on proper composition, and what do you use in the field to hint to you what composition technique that you need to use?