I once worked with a great programmer who didn't know the first thing about accounting, and therefore it was taking him forever to build some simple financial statements. But he knew his way around optimized code.
That is something that really impresses me about my boss. He has a very strong understanding of database design and implementation, hardware, programming, business processes and accounting. When guys from other departments come to talk to him, he seems to know more about their processes than they do.
