I just posted our latest feature on Cluster Monkey and thought the bioinformatics list may be interested: "Cluster Interconnects: The Whole Shebang" http://www.clustermonkey.net/ We provide an overview of the available technologies and conclude with two tables summarizing key features and ballpark pricing for various size clusters. While you are there, also check the other recent articles as well: * MPI: Is Your Application Spawnworthy? * MPI: The Spawn of MPI * Using the PIO Benchmark * Using the Globus Toolkit with Firewalls -- Doug