IBM made a slew of announcements and predictions on open source topics at this week's LinuxWorld conference, but one of the least talked about and written about announcements was this one (Matt Asay did single it out). IBM released its HPC Open Software Stack as open source, aiming at cheaper-to-deploy, simpler supercomputers. The software stack is  designed to make clusters--servers linked together to form a single super-fast system--more productive, less costly in both software and hardware terms,  and easier to manage. Why should the open source community at large pay attention to this?