  In recent years the promise of experimental study of the cosmic microwave
background (CMB) has been demonstrated. Herein a brief summary of the field is
followed by an indication of future directions. The prospects for further
revelations from the details of the CMB are excellent. The future work is
well-suited to the interests of high energy physics experimentalists: the
projects seek to understand the fundamental nature of the universe, require
subtle experimental techniques to keep systematics in control, produce large,
rich data sets, and must be implemented by multi-institutional collaborations.
