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TurboLinux has a product called TurboCluster that was originally based on the kernel patches developed by the Linux Virtual Server project. That means that it allows most of the same benefits, and it has the same drawbacks as the originating project. But TurboLinux has also developed some tools for monitoring the behavior of the cluster help to manage the cluster. It also has commertial support, that Linux Virtual Server hasn't.
EnFuzion is an upcoming scientific clustering product from TurboLinux that isn't based on Beowulf. It is suposed that it does support hundreds of nodes, runs any existing software, and it doesn't need custom parallel applications written to the environment. It supports automated load balancing and resource sharing between the nodes and failed jobs can be automatically rescheduled.