What are all the known applications of the ant colony optimization techniques?

ACO is supposed to be a swarm intelligence based learning algorithm which has been widely used for various optimisation problems.From a data mining stand point, its one of the best performing evolutionary algorithms in the domain of feature selection and rule mining. In fact Parpinelli et al used ACO to extract and mine simpler rules in the form of "If<con1>&<con2>&....&<condn> then predicted_label is X" from raw datasets.One can check out a package called myra available at http://sourceforge.net/projects/myra/ to explore rule mining on datasets using ACO.Some papers related to the description of AntMiner(ACO based rule miner) are "Data Mining with an Ant Colony Optimisation Algorithm by Parpinelli et al","Classification with Ant Colony Optimisation by Martens et al". A useful site may be http://www.antminerplus.com/ where one can find ACO applied to some interesting problems(Credit Risk Management,inferring business rules etc.) A lot of authors have explored the use of ACO in bioinformatics.Hybrid ACO algorithms have been reported of giving high classification accuracies for massive bioinformatics optimisation problems(Models for Cancer Classification etc).