Analysis of hits to the Stony Brook Algorithm Repository provides interesting insights to the demand for algorithms technology, and the state of the art of available implementations. It would be interesting to repeat this analysis at regular intervals to see how the demand changes over time.
This most important conclusion of this work is that there is a demand for high quality implementations of algorithms for several important and interesting problems. I urge members of the algorithm engineering community to consider projects for problems on the left side of Table 4, for these represent the real open problems in the field. Indeed, I would be happy to add any results of this work to the Algorithm Repository for others to benefit from.