I'm a big fan of professional profiling and insights assessments. I did my first one in 2006 and another about 18 months ago. The result of my most recent assessment is a 62 page, independent insights report that tells me, warts and all, my strengths, weaknesses, behaviours, motivators, self-perceptions, external perceptions and much more. I read this report regularly and challenge my choices based on these elements.
If you are going to be effective in business, then you need to get to know yourself and then continually evaluate where you need to delegate responsibilities, outsource work or find software solutions to help you be more effective.