What is cluster computing? In a nutshell, it involves the use of a network of computing resources to provide a comparatively economical package with capabilities once reserved for supercomputers. In this issue, we look at certain applications of cluster computing to problem solving. As the Beowulf project and clustering revolution celebrate more than 10 years in existence, it's interesting to see what remains the same and what has changed. Let's look at a few aspects of the clustering revolution in more detail.