Add PBS post.

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+[[!meta  title="Portable batch system"]]
+
+[PBS][] software schedules jobs to efficiently allocate the available
+computing resources.  It is often used on clusters, allowing users to
+queue jobs which are executed once enough worker nodes become
+available.  The main open-source PBS implementation is [Tourque],
+which provides the infrastructure.  [Maui][] (also open-source) plugs
+into Torque and provides the scheduling logic.
+
+See my [[cluster post|Abax]] for more details.
+
+[PBS]: http://en.wikipedia.org/wiki/Portable_Batch_System
+[Torque]: http://www.clusterresources.com/pages/products/torque-resource-manager.php
+[Maui]: http://www.clusterresources.com/pages/products/maui-cluster-scheduler.php