The recent CTA marketing seminar emphasized the importance of differentiating yourself. But how you do that? Working your workflow, a new long post at Tobias Rinche at Point Blank blog, stresses the importance of analyzing one's workflows - both to determine if they can be improved, but also to identifying things that make you stand apart from your competition.
Tobias' post seems aimed mostly at small companies, but what he says may work well also for individual freelancers, and certainly for formal or ad hoc partnerships.
Another fairly interesting link I found on differentiation is Differentiation: A Smart Small Business Marketing Strategy. It is clearly the kind of site that tries to sell you their coaching o marketing services, yet their articles seem genuinely useful - at least to a marketing beginner like me.