I was concerned about what blind spots I might have with the way I run my business. For example I am Australian and Australian’s are usually very informal, even in a professional setting - was my communication with international clients too informal?
To try and address these concerns I developed a feedback survey with Google Docs, which I have been (politely) requesting my clients to complete at the end of a job. The results have been helpful, and it also seems to have impressed some clients that I wanted their feedback. Wish I had thought of this earlier!