After the May's announcement of IBM taking over Cast Iron, IBM is introducing WebSphere DataPower Cast Iron Appliance XH35 V5.1 and is now available from July 29th 2010. You can read the enhancements over here. As you can notice, Cast Iron OmniConnect provides a single robust solution, designed from the ground up to deliver everything needed for cloud or SaaS to on-premise application integration. A 14 page Redguide on the OmniConnect is already out.
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A good reference article on the latest generation of appliances from WebSphere Datapower, of which 9005 is leveraged by WebSphere Cast Iron XH40 v6.1.x