RackSpace has recently released the Brocade Vyatta vRouter image to general availability on Cloud Servers. In combination with Cloud Networks the Brocade image can be used to build complex firewalled environments including VPNs. Reliable Penguin participated in the Early Access beta test for this new product. Here are a few links to useful information about the vRouter.
Not all control panel actions work with the vRouter. For example you have to reboot from the CLI. See this article for details: