The Wall Street Journal blog entry "Maxeler Makes Waves With Dataflow Design" discusses Maxeler, who make FPGA-based dataflow machines/
Apparently, J.P. Morgan is using Maxeler machines for end of day risk calculations. The time needed for the calculation dropped from 8 hours to 238 seconds. See "JP Morgan expands deployment of FPGA-based supercomputer".
Our group has a long history with dataflow, so it is gratifying to see a real-world dataflow solution.