The list of courses offered to employees through Continuing Education and Special Programs is now available online at http://www.ce.columbia.edu/employee/.
If you're a University employee you may be eligible for tuition exemption to take any number of courses, from atmospheric dynamics to classical Spanish and Flamenco dancing. You can cap off your workday by studying Japanese, learning about privatization in Eastern Europe or reading Victorian literature.
Certain prerequisites apply and there is an application process. Classes for the spring semester start on January 16.