I endorse having a look at how well Charlie Waite (www.charliewaite.com) has done with his square landscapes. Primarily working in colour, he also uses B+W. Having bought an SQA on impulse 5 years ago, discovering his books helped me enormously with landscape and in the use of the square format.
My SQA doesn't get out much now, but I do still appreciate good square images. Think of them as a happy halfway house between Portrait and Landscape format!