In conjunction with the annual Laboratories for the 21st Century conference (Albuquerque, Sept. 28-30), DataCenters21 will be a symposium focused on making the design and operation of these energy-intensive facilities more sustainable. Topics to be covered include IT equipment power use; environmental conditioning issues; and cooling options. Organizers are now soliciting abstracts for presentations to be given at the meeting, and are particularly interested in abstracts relating data centers to labs. For information or to submit an abstract, visit http://www.i2sl.org/labs21/conference/data_centers.html. The deadline is March 26.