I know continual learning is an important part of being an external auditor because it helps ensure I am up to date on changing regulations and the like. I take occasional classes offered by ISACA, the Institute of Internal Auditors and the Institute of Management Accountants to stay fresh on industry-related topics. I also strive to attend workshops and conferences as they fit into my schedule. I think it is important for professionals to at least take the time to read related publications and talk with their peers.