Oddly enough, Cray recently sold their interconnect tech to Intel [0]. Intel seems to be planning to integrate it on-chip down the road [1], which seems to leave Cray serving as a somewhat quirky system integrator longer-term.

[0] http://newsroom.intel.com/community/intel_newsroom/blog/2012...

[1] http://www.hpcwire.com/hpcwire/2012-09-10/intel_weaves_strat...