I encountered this site while tracking down resources for the DASPOS post.
From the homepage:
The Cooperative Computing Lab at the University of Notre Dame seeks to give ordinary users the power to harness large systems of hundreds or thousands of machines, often called clusters, clouds, or grids. We create real software that helps people to attack extraordinary problems in fields such as physics, chemistry, bioinformatics, biometrics, and data mining. We welcome others at the University to make use of our computing systems for research and education.
As the computing requirements of your data mining or topic maps increase, so will your need for clusters, clouds, or grids.
The CCL offers several software packages for free download that you may find useful.